Yoinked from here.

Notable Changes:
Certain Characters are no longer considered prohibited words;
The game does no longer force-shutdown when trying to input such characters;

Source

Notable Changes:
Latin American Spanish is now a language option;

Source

Other Bugfixes:
Delivery Requests will no longer disappear from the list at the Resource Center when playing in offline mode;

Source

Notable Changes:
Limited Time quest: "Monster Hunter", crossover with the movie;
Savi'jiiva siege now scales to 1, 2 and 4 players;
You can no longer send/approve squad join requests, unless you're in the same hub;
Scarred Yian Garuga will no longer become trapped/unable to land on certain terrain in the Ancient Forest;
Traps no longer make Fatalis immune to flinching, clutch claw attacks, part breaks, sleep, paralyze or heavy weaponry;
Event quests are now available indefinetly;

Miscellaneous:
New BGM for your room;
Festival Tickets added to list of meldable items at the Elder Melder;


Other Bugfixes:
Deathbow Vaal Velos now uses the Blackveil Vaal Hazak model, instead of regular Vaal Hazak;
Other miscellaneous bug fixes;

Source

Other Bugfixes:
Interacting with previously unpurchased paid DLC now brings you to the correct store page;

Source

Notable Changes:
Arch-Tempered Velkhana (limited-time event), Fatalis;
Added skill: Clutch Claw Boost;
Soul Stream 3 added to the First Wyverian Ritual;
Rarity 9 decorations can now be used as melding materials;
Added decorations to the Elder Melder: Elementless 2, Shield (Guard Up) 2, Sharp (Protective Polish) 2, Dragonseal (Elderseal Boost) 3, Mighty Bow 2, Mind's Eye 2;
Added the following charms: Shaver (Clutch Claw Boost), Earplugs V, Master's (Critical Eye) V, Critical (Critical Boost) III, Exploiter (Weakness Exploit) III, Handicraft V;
Added decorations to the reward pool: Diversion (Provoker) 3, Acrobat (Safe Landing) 3, Shaver (Clutch Claw Boost) 3;
Removed the end date of "The Evening Star" and "Dawn of the Death Star" event quest, making them permanent additions;

Miscellaneous:
New BGM for your room in Seliana;
New designs for the Squad Card;
New layered Armor;
New Pendants;
Steamworks' Overdrive bonus can now reward decorations (for your room);
Not previously purchased DLC in-game will now send you to the respective shop page when interacting with them;
Added the previously missing voice dialogue to previous title updates;
Wounds are now visible longer on monsters;
High Rarity decorations now appear more often from Carved and Sealed Feystones;
Threat level 3 tempered master rank investigations now have a higher chance to reward Sealed Feystones;
The Light Bowgun tutorial no longer pops up continuously;

Other Bugfixes:
Flinch Shot now works on Nightshade Paolumu and Legiana;
Furious Rajang's pin attack now actually pins the player it hits;
Seliana Supply Cache: Monsters no longer land mid-air, monsters no longer get stuck at the Dragonrazer, monster's attacks can no longer hit players in the camp area;
Alatreon: Blinking reduced during Escaton Judgement; EJ can no longer be prevented by a party member disconnecting; puddles created by Alatreon now display correctly; Alatreon's size will now display properly; Players will now get dismounted if flinch shot is used against Alatreon; When mounting Alatreon, stamina is now consumed properly;
Reverted Demonlord Cannon's LV 3 normal count to a previous version;
Critical Draw now works in the Secluded Valley;
Wyrmstake Cannon and Wyrmstake Blast no longer shoot in the opposite direction;
Battle music from "The Eternal Gold Rush" quest no longer carries over into after completion;
You can no longer generate normally unobtainable items;
Other miscellaneous bug fixes

Source
Developer Diary: The Final Stand

Other Bugfixes:
Certain Monsters (Glavenus, Anjanath, their subspecies) no longer perform unintended (unnamed) behavior towards palicos;

Source

Notable Changes:
Added data for future event quests;


Other Bugfixes:
Fixed a spelling mistake in the update notice window (on french setting: CODIV-19 → COVID-19);
Other miscellaneous bug fixes

Source

Notable Changes:
New Monsters: Frostfang Barioth (limited-time event quest), Alatreon;
Added the following charms: Draw (Critical Draw) III, Phoenix (Coalescence) III, Fitness (constitution) V;
Mounts will now be auto-canceled if the mounted monster are paralyzed or put to sleep mid-air;
Wyrmstake Blast that is attached to Safi will not disappear when returning to camp;
Rocks in Origin Isle can now be destroyed when the host player is in the tent;
When countering attacks successfully, you no longer get the abnormal status attached to the attack you countered;
Raging Brachydios can no longer be captured under certain conditions;
Temporal Mantle now works against Namielle;
Master Rank Kulve's gold mantle will now soften during a mount;
Attempting to use an item via the custom radial menu will now also craft it, if you have the materials (but none of the item);
Slinger Ammo will now fire at where you actually aim, instead of the opposite direction, when fighting KT;
Swapping the host during the Eternal Gold Rush quest no longer results in the game crashing;

Miscellaneous:
You can now create tracks for the Guiding Lands at the Elder Melder;
New decoration and BGM for your room in Seliana;
New designs for the Squad Card;
New Pendants;
Using Screamer Sacs to combine Screamer Pods now yields more pods;
Guiding Lands capture reward for tempered Gold Rathian: Elder Spiritvein Bone → Spiritvein Solidbone;
Raging Brachydios' tail tip now becomes wounded when tenderizing the tail;
Scarred Yian Garuga quest: You can no longer spawn next to the target monster;

Other Bugfixes:
Safi'jiiva recon assignment now appears for characters in the 2nd saved data slot;
The "!" icon indicating important dialogue will now display properly above characters;
You can no longer force unobtainable items to appear at the Elder Melder;
Moonlight Gekkos can now appear as small size in the Elder's Recess;
Master Rank Kulu-Ya-Ku and Tzitzi-Ya-Ku now drop slinger ammor;
Checking on a bowgun player from the player list while having a Bow equipped no longer bugs out the status screen;
Item Display On/Off for Fixed Items in base now actually works as intended;
Watching the "Nature's Might" in the gallery, then starting the game and completing the quest "Faraway Lorelei" no longer causes the game to go mute;
Other miscellaneous bug and text fixes

Source
Developer Diary 6

Notable Changes:
New Monsters: MR Kulve Taroth, Arch-Tempered Namielle, both as event quests for a limited time;
More layered weapons;
KT Weapons can now be rerolled at the Elder Melder, aswell as upgraded to Master Rank at the Smithy;
Appraisal Weapons now easier to obtain from KT Siege, higher rarity ones easier to obtain;
Added charms: Attack V, Evasion V;
You can now properly accept the next Recon Assignment from the Hub's Pub Lass after completing "Across the Lost Path";
You can now properly carve the severed tail of Raging Brachy;
Furious Rajang will no longer behave weirdly when it performed the final part of its pin attack if it's performed on breakable ground; Getting hit by its pin attack when wearing the Rocksteady Mantle, you no longer get sent flying in the wrong direction;
During the Safi Siege, objectives will no longer appear as completed if they haven't been;
Dual Blades clutching attack no longer forces off other players who's grappled onto a monster;
Longsword: You no longer accidentally take damage when successfully performing Foresight Slash;

Miscellaneous:
New Pendants;
Poison no longer cancel drinking animation of other items;
You no longer sometimes perform a guard? Original text from patchnote: "Fixed an issue where, when certain conditions were met, the player would perform a guard animation with a weapon drawn.";


Other Bugfixes:
Fixed an issue where canceling a grapple off of a monster near certain walls/boundaries in the tundra region of the Guiding Lands would result in the player getting stuck behind the wall or out of bounds. Fixed an issue where an error would occur when checking add-on content while online. Other miscellaneous bug fixes

Source

Notable Changes:
Fixed an Issue, where Capcom couldn't collect Data even if you gave consent. Now, data can be collected properly. Gameplay is not affected;

Source

Notable Changes:
New Monsters: Raging Brachydios, Furious Rajang;
Added Banishing Ball;
Steamworks: Added option for 10x input/output, Auto-Mode unlocked by achieving Overdrive at least once, aswell as collecting item rewards at any point instead of only after Overdrive;
Added the following charms: Fury (Resentment) V, Power (Latent Power) V, Mighty (Max Might) III, Challenger (Agitator) V;
Awakened Weapons: Abilities now rotate properly instead of looping indefinetly;
Safi: Behaves normally on slanted terrain and transitions normally now; Siege Result Screen and information at the Quest Counter are now synced properly;
Lance: When using counter-thrust, you no longer suffer abnormal statuses or blights as if you were hit;
Challenge Quests: Multi-Monster Quests: The second monster will now appear properly and not pre-emptively count the quest as completed;
Yian Garuga: Pitfall mechanic now functional;
Rajang: When whiffing its pin, Rajang will no longer perform the rest of this move;
Handicraft will now work properly on Quest Load-In;
Longsword: Spirit Helm Breaker now easier to land sometimes; Critical Draw no longer applies to Iai Slash →Spirit Blade 1;
Guns: Free Element/Ammo Up now works on guns that had their capacity raised with awakening;
Switch Axe: Fixed the grapple point of ZSD;

Miscellaneous:
Level cap for Armor raised;
Augmentation Feature added for customizing weapon looks;
Additional Pendants added;
New decoration and BGM for Seliana Room;
Added new designs for the Squad Card;
Hunter Helper Rewards extended to MR quests;
Insect Glaive: Flinch Free bonus from extracts no longer carry over when swapping weapons, Element Level increased on Elscarad and Arginesse;

Other Bugfixes:
Squad info will no longer be sometimes accidentally deleted;
Certain tracks are now displayed in The Guiding Lands;
Ruiner Nergigante will no longer spawn or be displayed prematurely in The Guiding Lands;
Using Flinch Shot on Rathalos while it is transitioning areas no longer crashes the game;
Beetle Ticktes can now be used as melding materials;
Raider Rides no longer gets stuck on walls sometimes;
"Take All" and "Sell All" options for oven roast are now no longer reverse when the total of prepared items from it is 9999;
Sometimes entering your room will not cause an error;
The Witcher Weapon will now be displayer properly when placed on the equipment display;
Other miscellaneous bug fixes

Source
Developer Diary 5

Miscellaneous:
Noticed an Issue with the Lynian Researcher's Photo Requests, Fixed it with this Patch

Source

Notable Changes:
"Across the Lost Path" now unlocks properly;
Safi'jiiva: rewards no longer accidentally capped at level 16;
Safi'jiiva: You can no longer obtain KT rewards from the Safi siege "when performing certain inputs";
Points are now properly added to awakened Safi weapons;
Status Effect Up VI now no longer rolls as a choice when it's already been added to the weapon;

Miscellaneous:
Energy gauge for levels during Safi siege now displayed properly;
Remaining Energy now properly displayed in the result screen of the Safi Siege when playing offline;
When another group slayed Safi, other parties' objective progress now updates properly;

Other Bugfixes:
(True) Dragonvein Awakening now applies to Charge Blade's mounted finishing attacks, aswell as to Guns, Switch Axe, Charge Blade,... moves when sheathing before the damage pops up;
Fixed issues where the game would freeze, when you: Shoot with the Heavy Bowgun, use a Flashbug, Talk to the First Wyverian, eat at the canteen;
Other miscellaneous bug fixes

Source

Notable Changes:
Switch Axe: ZSD will now connect to the head rather than the wings or stomach, when used on a monster's head

Source

Other Bugfixes:
Fixed unintentional behavior when multiple people use the weapon pose

Source

Notable Changes:
Released Safi'jiiva, Stygian Zinogre;
Added Tundra Region to Guiding Lands;
Added Tempered Ruiner Nergigante;
The following decorations are now easier to obtain: 　Blaze Jewel+ 4, Stream Jewel+ 4, Frost Jewel+ 4, Bolt Jewel+ 4, Dragon Jewel+ 4, Venom Jewel+ 4, Paralyzer Jewel+ 4, Sleep Jewel+ 4, Blast Jewel+ 4 Adjusted design on how other players are knocked back from explosions caused by the gunlance's Wyrmstake Blast. Removed the damage reaction from the startup of the sword & shield's Claw Uppercut. The sword & shield's Claw Uppercut can now soften a monster's hide. Adjusted damage on the sword & shield's Perfect Rush. Adjusted various dual blade actions. Instead of dropping slinger ammo, the dual blades' Spinning Rising Slash will now wound parts easier. Fixed an issue where cluster bomb reload speed was normal or reload wouldn't perform while aiming when using the heavy bowgun. Adjusted design on the hunting horn's Extended Health Recovery so health could be regained even when taking damage over time. Adjusted how much ammo is used by the flinch shot when the Slinger Capacity skill is active. Adjusted the Frostcraft skill so that the insect glaive will no longer consume its gauge when performing a moving mounted attack. Fixed an issue where the Long Sword's Foresight Slash, Iai Slash or the Evasion Mantle would successfully trigger an evade against Velkhana's frost, large monsters being knocked down, and other behavior that normally does not have any attack properties. Made adjustments to the dual blades' Spinning Rising Slash along with increasing some elemental scaling.

Miscellaneous:
New decor can now be placed in your room in Seliana. New BGM can now be played in your room in Seliana. New designs for the Squad Card added. New Pendants added. Starter-friendly Defender weapon line added (forgeable at the Smithy). Starter-friendly Defender α armor set added (purchasable from the Armory). New layered armor added. New feature added to upgrade armor to its maximum level automatically with the available armor spheres. When obtaining analyzed special tracks in the Guiding Lands or when analysis is finished, other players in your expedition will now obtain the same special tracks. The leader of the Guiding Lands expedition can now decrease specific region levels manually by speaking to the Handler. New Weapon Pose added. Your hunter will perform different poses depending on the equipped weapon. Added some Guiding Lands materials to the lineup of possible items that you can meld at the Elder Melder. Region Level Fix option available while in the Guiding Lands. Changed design so all ammo types are reloaded when exiting your tent with a bowgun equipped. Shining Wyvern Blade was renamed to Platinum Dawn. (This name was changed to match its appearance) Fixed an issue where the game would freeze when displaying certain dual blades in the Equipment Display in Your Room in Seliana. Fixed an issue where Brachydios would get stuck on top of ledges in the special arena. Fixed an issue where Legiana would continue to walk instead of fly after an avalanche is triggered in area 4 of the Hoarfrost Reach. Fixed an issue where master rank Lunastra wouldn't use its flare attack. Fixed an issue where Gold Rathian would take more time than usual to land after attacking with its hellfire breath. Fixed an issue where certain attacks from monsters would hit twice. Fixed an issue where Gold Rathian would roar non-stop if led to a specific area of the Elder's Recess. Fixed an issue where in the Coral Highlands, monsters would get caught in environmental traps instead of being knocked down as a result of colliding with a wall from a clutch claw flinch shot. Fixed an issue where the Master Gatherer skill effect wouldn't activate when mining with the pickaxe. Fixed an issue where a flinch shot would occur when grappled onto a monster, even though no button had been pressed. Fixed an issue where characters could fall off the map in the Coral Highlands.

Other Bugfixes:
Updated an error message that is displayed when saved data is damaged. Fixed an issue where portions of save data would be erased under certain conditions for users who have cleared the "Paean of Guidance" and "To the Guided, A Paean" quest. Other miscellaneous bug fixes

Balance Changes:
Sword and Shield:
Leaping Slash: 22 → 30;
Perfect Rush 1 (1st Hit): 16 → 25;
Perfect Rush 1 (2nd Hit): 14 → 23;
Perfect Rush 1 (3rd Hit): 14 → 30;
Perfect Rush 2: 25 → 35;
Perfect Rush 3 (1st Hit): 20 mv, 1.15 status → 45 mv, 1.5 status;
Perfect Rush 3 (2nd Hit): 20 mv, 1.2 status → 45 mv, 1.8 status;
[Timed] Perfect Rush 1 (1st Hit): 35 → 45;
[Timed] Perfect Rush 1 (2nd Hit): 30 mv, 1.15 ele → 45 mv, 1.2 ele;
[Timed] Perfect Rush 1 (3rd Hit): 44 mv, 1.15 status → 60 mv, 1.2 status;
[Timed] Perfect Rush 2: 44 mv → 55 mv;
[Timed] Perfect Rush 3 (1st Hit): 35 mv, 1.15 ele → 65 mv, 1.35 ele;
[Timed] Perfect Rush 3 (2nd Hit): 65 mv, 1.3 Partbreak, 1.2 ele → 70 mv, 2.5 Partbreak, 1.8 ele;
Claw Uppercut Now applies 50 Soften buildup;

Dual Blades:
Double Slash, Return Stroke, Lunging Strike, Rising Slash (from Lunging Strike), Jumping Double Slash (all hits): 0.5 ele → 0.6;
Circle Slash: Right hits: 0.6 ele → 0.7 ele; Left hit: 0.5 ele → 0.7 ele, 0.4 status → 0.5 status;
Turn Slash: 0.5 ele → 0.6 ele; 0.4 status → 0.5 status;
Roundslash: 0.4 ele → 0.6 ele, 0.4 status → 0.5 status;
Double Roundslash: 0.7 ele and status → 1 ele and status;
Demon Flurry, First Four hits: 0.7 ele → 0.8 ele, 0.5 status → 0.6 status;
Demon Flurry, Last Three hits: 0.8 ele → 1 ele, 0.7 status → 0.8 status;
Demon Fangs: 0.6 ele → 0.8 ele;
Twofold Demon Slash, Sixfold Demon Slash: 0.6 ele → 0.8 ele;
Fade Slash (L, R), Rising Slash (from Fade Slash): 0.7 ele → 0.8 ele;
Demon Flurry Rush, First Four hits: 0.5 ele → 0.6 ele;
Demon Flurry Rush, Last Two hits: 0.5 ele → 1 ele, 0.5 status → 0.8 status;
Rising Slash (from Demon Flurry): 0.7 ele → 0.8 ele;
Blade Dance: Hits 3-8: 0.6 ele → 0.8 ele;
Blade Dance: Hits 9-14: 0.7 ele → 0.8 ele;
Sliding Slash: 0.6 ele → 0.7 ele;
Midair Spinning Blade Dance, First Two hits: 0.4 ele → 0.5 ele;
Midaur Spinning Blade Dance, Last Two hits: 0.6 ele → 0.7 ele;
Spinning Blade Dance Finisher, after Mid Air Blade Dance only: 0.7 ele → 0.56 ele;
Clutching, Weapon Attack: First Three hits: 0.8 ele and status → 0.7 ele and status;
Clutching, Weapon Attack: Fourth hit: 0.5 ele and status → 0.7 ele and status;
Clutching, Weapon Attack, Multihits: 0.8 ele and status → 0.7 ele and status;
Clutching, Spinning Rising Slash (both hits): 5 Soften buildup → 25 Soften buildup;

Source
Damage changes Source
Developers Diary 4.0
Developers Diary 4.5

Notable Changes:
Rex Roar Helm β+: Free Meal 2 → 1;
Yian Garuga now drops special tracks;
Lunastra's Hellflare no longer hits people in the tent;
Azure Rathalos no longer gets stuck on the edges of pathways in the Ancient Forest;
The Clutch Claw can now perform claw attacks after grappling onto a monster while mounted;
Hunting Horn: You can now perform melodies stocked from echo attacks;
Hammer: Grappling onto a monster no longer automatically forces you to use flinch shot;
Quest complete time limit adjusted for: "Farewell to the Frozen";
Quest Members no longer get auto-disconnected when the quest locale is Elder's Recess;

Miscellaneous:
Order of Decorations changed;
Volcanic Region of Guiding Lands now displayed on the World Map in the base;
Palico: negative affinity no longer treated as positive affinity;


Other Bugfixes:
Caught fishes no longer only regular sized;
Endemic Life now has proper size fluctuations;
Molys are no longer more likely to spawn when eating for Felyne Zoomaster;
Other miscellaneous bug fixes

Source

Notable Changes:
New Monster: Rajang;
You can now make your room public to others;
Music player added to room;
Quest: A New Troublemaker in Down: Fewer Rewards (announced in 11.50);
Challenge Quest 2: MR Intermediate: Monster difficulty decrease, adjustment of completion times, HBG Loadout had wrong amount of decorations (announced in 11.50);

Miscellaneous:
New room decor;
Customization added for Squad Cards;
More craftable layered armors;
Kinsects can now be added to the wishlist;
Developers Diary 3

Other Bugfixes:
Squad join requests are no longer automatically approved if settings are set to normal;
Raider Rides no longer get trapped in certain locales;
Frostcraft now works peroply on Longsword: Spirit Helm Breaker, and Hunting Horn: Performance;
Brightness adjustments to account for Flash Pods and Flashflies;
Other miscellaneous bug fixes

Source 11.00
Source 11.01

Notable Changes:
"Low level Hunter Helper Reward" can no longer be obtained after failed quests;
Expeditions no longer update each time you use the "Change Objects in Area" option in the training area;

Miscellaneous:
Handler no longer wanders around in the Ancient Forest;

Other Bugfixes:
You can now pick the Guardian armor during character creation;
Fixed the Bug where players would get the same decorations on loop when using the Elder Melder's First Wyverian Ritual;
Great Sword: You can now use charge attacks when standing on ice or in mud;
Other miscellaneous bug fixes

Source

Notable Changes:
Addition of Master Rank and Guardian Armor Set and Weapons
Addition of the Clutch Claw
New moves and combos for all weapons
All Weapons can now use the Slinger unsheathed
Raised Palico level cap and gadget proficency cap
Tailraiders can now be mounted and ridden to marked areas and monsters
Temporal Mantle: 90s Active/300s Cooldown → 120s Active/300s cooldown, -20s active time every time effect is used;
Glider Mantle cooldown: 210s → 120s;
Assassin's Hood: Flinches monsters from mid-air attacks in stealth mode instead of knocking them down;
Palicos: Max level: 30 → 50, Max Gadget: 10 → 15, Tailrider max level: 5 → 10;
Wex nerf: 50% on 45+ hitzone → 30% on 45+ hitzone, +20% if tenderized
When departing for quests, you'll now either spawn in camp, next to the monster or nearby rare gathering locations;
Quest difficulty now scales in real-time in accordance with people joining/leaving your quest;
Flash pod nerf: Monsters now build tolerance to flashes, up until complete immunity;

Miscellaneous:
Character Creation now uses numerical values;
Extended Squad functionality: Ability to assign Sub-leaders, more emblem designs and ability to re-edit emblems, addition of Squad Card;
You can now buy Palico Edit Vouchers;
Added 2-player scaling;
Extra slots for: Item Loadouts, Equipmen Box and Equipment Loadouts, Wishlist;
Layered armor;
Endemic Life now has sizes and crowns;
Small tracks pick up animation can be canceled sooner;
Mounting minigame completes faster;
Sword and Shield, Greatsword, Gunlance and Lance can now block in the knocked down state;
Slinger reload is faster, Flash Pods fire faster but have smaller area of effect;
Monster beams no longer trigger Vitalilies, Sporepuffs etc;
Monsters with friendly Relations (Rathian and Rathalos, for example) no longer flinch each other;
Health and Stamina can now be set to perma-display;
Color Blind settings added;
Custom Radial Menu can now be linked to Item Loadouts;
"Craft All" option added to Radial Menu;
"Take All" option added to quest reward screen;
Sharpness gauge now displays Handicraft effect (half sized bar);
Layered Armor, ability to craft Layered Armor;
Bowgun customization added;
Charms you already crafted are now displayed with a checkmark at the smithy;
Sort Decorations option added to the Set Decorations menu;
You can now cultivate Dung Pods;
Delete all unregistered investigations option added;

Other Bugfixes:
Other miscellaneous bug fixes

Balance Changes:
Great Sword:
Charged Slash 2: elemod 1.1, status 1.2 → elemod 1.3, status 1.3;
Charged Slash 3: 105 mv, 1.2 elemod, 1.3 status → 110 mv, 1.5 elemod and status;
Strong Charged Slash 1: 65 mv, 1.1 ele, 1.2 status → 82 mv, 1.4 ele and status;
Strong Charged Slash 2: 90 mv, 1.15 ele, 1.3 status → 111 mv, 1.5 ele and status;
Strong Charged Slash 3: 115 mv, 1.2 ele, 1.5 status → 131 mv, 1.70 ele and status;
TCS (Big Hit) 1: 165 mv, 1.3 ele, 1.4 status, 1.35 partbreak mod → 120 mv, 1.4 ele and status, 1.0 partbreak mod (power: 144 mv, 1.4 status and ele, 1.1 partbreak mod);
TCS (Big Hit) 2: 182 mv, 1.4 ele, 1.5 status, 1.5 partbreak mod → 175 mv, 1.5 ele and status, 1.0 partbreak mod (power: 210 mv, 1.5 status and ele, 1.2 partbreak mod);
TCS (Big Hit) 3: 211 mv, 1.5 ele, 1.7 status, 1.7 partbreak mod → 211 mv, 1.7 ele and status, 1.5 partbreak mod (power: 264mv, 1.8 status and ele, 1.3 partbreak mod);
Strong Wide Slash 2: 1 ele and status → 1.3 ele and status;
Strong Wide Slash 3: 1 ele and status→ 1.5 ele and status;
Leaping Wide Slash 1: 71 mv, 1.8 ele and status → 75 mv, 2.2 ele and status;
Leaping Wide Slash 2: 85 mv, 2.45 ele and status → 96 mv, 3.15 and status;
Leaping Wide Slash 3: 110 mv, 2.9 ele and status → 118 mv, 3.5 ele and status;
Jumping Slash 1: 70 mv → 58 mv;
Jumping Slash 2: 92 mv, 2.45 ele and status → 69 mv, 1.1 ele and status;
Jumping Slash 3: 110 mv, 2.9 ele and status → 87 mv, 1.2 ele and status;
Sliding Attack 2: 1.2 ele and status → 1.3 ele and status;
Sliding Attack 3: 1.3 ele and status → 1.5 ele and status;
Mounted Attack 1: 70 mv + 28 mv → 100 mv + 58 mv;
Mounted Attack 2: 92 mv, 1.2 ele, 1.3 status + 35 mv, 1.2 ele and status → 122 mv, 1.3 ele and status + 72 mv, 1.3 ele and status;
Mounted Attack 3: 106 mv, 1.3 ele and status + 46 mv, 1.3 ele and status → 139 mv, 1.5 ele and status + 89 mv, 1.5 ele and status;

Long Sword
When using Foresight Slash, if you cannot use the Spirit Gauge, the Critical Eye effect will not activate. Attack hitbox and attack power have been decreased. 14/26/1 → 12/26/1 Fixed an issue where the Spirit Roundslash would deal damage of the aura level above the current level. Spirit Roundslash now deals damage based on current spiritlevel, instead of (sometimes) one level above current
Overhead Slash now properly leads into Foresight Slash instead of Spirit Blade
"Decreased" Spirit Slash 3: 12+14+34 mv → 14+19+34 mv
"Decreased" damage on the mount finisher if done to the head: 34 mv → 15+34 mv

Sword and Shield
You can no longer sheathe after firing slinger ammo
Slinger Shots can now be cancelled with an evade
Fixed some issues cause by input buffering
The first shield attack of Backstep → Charged Attack no longer uses sharpness

Dual Blades
Super armor is now applied correctly when climbing a ledge
Element and Status changes:
Double Slash, Lunging Strike, Rising Slash, Turn Slash, Roundslash, Jumping Double Slash: Elemod/Status 1 → 0.5 Ele, 0.4 Status;
Circle Slash: Ele/Status 3 (total) → 1.7 Ele (total), 1.4 Status (total);
Double Roundslash: Ele/Status 1 (on every hit) → Ele/Status 0.7 (on every hit);
Demon Flurry: Ele/Status 1 (on every hit) → Ele 0.7, Status 0.5 (First 4 hits) + Ele 0.8, Status 0.7 (Last 3 hits);
Demon Fangs Ele/Status 1 → Ele 0.6, Status 0.5;
Twofold, Sixfold: Ele/Status 1 → Ele 0.6, Status 0.5;
Fade Slash, Rising Slash: Ele/Status 1 → Ele 0.7, Status 0.6;
Demon Flurry Rush: Ele/Status 1 → Ele/Status 0.5;
Rising Slash: Ele/Status 1 → Ele 0.7, Status 0.6;
Blade Dance: Ele/Status 1 (on every hit), total: 16 Ele and Status → Ele/Status 0.8 (first two hits and last two hits) + Ele 0.6, Status 0.5 (hits 3-8) + Ele 0.7, Status 0.6 (hits 9-14), total: 11 Ele, 9.8 Status;
Sliding Slash: Ele/Status 1 (every hit) → Ele/Status 0.6 (every hit);
Mid-Air Spinning Blade Dance: Ele/Status 1 (every hit, total: 6) → Ele/Status 0.4 (2x) + Ele/Status 0.6 (2x) + Ele/Status 0.7 (2x), total: 3.4;
Heavenly Blade Dance: Ele/Status 1 (every hit) → Ele/Status 0.4 (every hit);
Spinning Blade Dance Finisher: Ele/Status 1 (every hit) → Ele/Status 0.7 (every hit);
Mounting: Demon Flurry: Ele/Status 1 (every hit) → Ele 0.5, Status 0.4 (every hit);
Mounting: Demon Flurry Repeated: Ele/Status 1 (every hit) → Ele 0.7, Status 0.6 (every hit);

Hammer
Increased stun on Charged Upswing: 45 → 50; Charged Brutal Upswing: 55 → 58;
Spinning Strong Upswing can now lead into Overhead Smash 1

Hunting Horn
Increased movement angles during Performance;
Jumping Draw Attacks while wearing the Glider Mantle no longer adds two notes;
The following moves are now faster: Right/Left Swing, Performance (start up), Encore, Front/Back/Side Performance, Right/Left Performance with 3 notes;
Backward Strike: 34 mv → 37 mv;

Lance
Element nerfs:
Mid Thrust 1, 2 and 3: Ele/Status 1 → 0.7;
High Thrust 1, 2 and 3: Ele/Status 1 → 0.7;
Wide Sweep 1, 2 and 3: Ele/Status 1 → 0.7;
Guard Thrust, Counterthrust: Ele/Status 1 → 0.7;
Finishing Thrust: Ele/Status 1 → 0.8;
Finishing Twin Thrust, 1st Hit: Ele/Status 1 → 0.7;
Finishing Twin Thrust, 2nd Hit: Ele/Status 1 → 0.8;
Reverse Attack: Ele/Status 1 → 0.8;
Jumping Thrust, Advancing Jump Thrust: Ele/Status 1 → 0.7;
Mid-Air Dash Attack: Ele/Status 1 → 0.7;
Mounting: Finishing Thrust 1, 2 and 3: Ele/Status 1 → 0.7;

Gunlance
Charged Shells charge faster;
Knockdown effect removed from Wide Sweep;
Long charged Shelling and Normal Burst fire: fixed damage increased (values unknown);
Wyrmstake Blast loads faster and can combo now;
Shelling added after lateral shelling, thrust and lunging upthrust;
Wyrmstake Blast loading animation now has a Guard Point;
While having the Guard armor skill: Guard can now lead into Wyrmstake Blast;

Switch Axe
Wild Swing input buffer lasts much longer;
Wild Swing → Overhead Slash now easier to execute;
Fade Slash, Left/Right (Axe mode) and Morph Slash (into Sword mode) now move you further;
(cancelled) ZSD endlag can now be cancelled by Morphing to Axe;
Super Armor now properly applies when climbing ledges in axe mode;
Downward Fade Slash endlag reduced;
MV Changes:
Axe: Overhead Slash: 40 → 45;
Axe: Rising Slash: 25 → 31;
Wild Swing: Ele/Status 1 → Ele/Status 0.8;
Element Discharge: Ticks: 6 → 8;
Element Discharge (Amped): Thrust: 15 → 18, Ticks (up to 12x): 12 → 13
Bridging Slash: 10 → 15, when amped: 12 → 20;
Heavenward Flurry, 2nd hit: 34 → 35;
Heavenward Flurry (Amped), 2nd hit: 35 → 38;
Element Discharge Finisher: 80 → 82;
Element Phials buffed: +30% → +45%;

Charge Blade
SAED: ele phials now hit closer together;
Animation fixes for: Charging phials, (S)AED → morph to sword, phials during (S)AED;
Return Stroke now requires holding the button;
You will now fall off a ledge properly when guarding while falling;
MV adjustments:
Sword: Spinning Slash, Axe: Morph Slash, Element Roundslash 28: → 30;
Sword: Condensed Element Slash 75 → 60;
Axe: Smash, Sword: Morph Slash 44 → 50;
Axe: Dash Slam: 45 → 52;
Axe: Rising Slash 35 → 38;
Axe: Overhead Slash 37 → 48;
Axe: Element Discharge 1, Rushing Element Discharge 1: 21 → 25;
Axe: Element Discharge 2 (1st Hit): 10 → 20;
Axe: AED: 90 → 82;
Axe: SAED (2nd Hit): 90 → 82;
Axe: SAED (3rd Hit): 97 → 66;
Axe: SAED (2nd Hit, No Phials): 90 → 82;
Element Phial: Elemod 3.5 → Elemod 2.0;
Element Phial (SAED): Elemod 10.0 → Elemod 9.0;
Axe: Jumping Slash, Sword: Jumping Morph: Slash 46 → 55;
Sword: Sliding Slash: 25 → 30 mid-combo, aswell as 25 → 18+16, ele/status mod 1 (each) when used out while sliding;

Insect Glaive
Kinsect hits targeted monsters easier now;
Jumping and Strong Jumping Advancing Slash now consume stamina;
Damage Changes:
Thrust, Leaping Slash, Rising Slash, Wide Sweep and Strong Wide Sweep (both), Overhead Slash, Tornado Slash (all hits), Strop Reaping Slash, Tornado Slash, Strong Rising Slash Combo (all hits) and Strong Thrust Dodge Slash: Elemod 1 → 0.8;
Rising Slash, Double Slash: Elemod 1 (all hits) → 0.7 (first hit) + 0.8 (second hit);
Strong Double Slash: Elemod 1 (all hits) → 0.6 (first hit) + 0.8 (second and third hit);
Strong Jumping Slash: 10 mv, 15 mount, Ele/Status 1 → 8 mv, 20 mount, Ele/Status 0.6;
Dust Explosion (Blast): fixed damage: 0 → 10;
Dust Explosion (Para): fixed damage: 0 → 3;
Dust Explosion (Poison): fixed damage: 0 → 5;
Mounting: Flying Slash: Ele/Status 1 (all hits) → 0.7 (all hits);
Sweetspot Mechanic for +3% raw;
Kinsect Boost:
Sever: 20% → 30%;
Element: 20% → 40%;
Speed: 50%;
Stamina Boost: 50%, Double stam regen, halved stam cost, stamina covered on recall 30 → 50;
Healing: 20% → 50%;

Bow
Super Critical Range will now be displayed;
Normal Shots:
Level 1: partbreak mod 1, elemod 0.5 → partbreak mod 0.5, elemod 0.2;
Level 2: PB 1, Ele 0.7 → PB 0.7, Ele 0.35;
Level 3: Ele 1 → Ele 0.7;
Level 4: Ele 1.05, Status 1.2 → Ele 0.8, Status 1.1;
Power Shots:
Level 1: Elemod 0.5 → 0.3;
Level 2: PB 1 Ele 0.7 → PB 0.7, Ele 0.5;
Level 3: Ele 1 → 0.7;
Level 4: Ele 1.1, Status 1.2 → Ele 1, Status 1.1;
Arc Shots: Levels 1-4, stun: 5/5/10/15 → 2/3/5/10;
Dragon Piercer:
Level 1: 3 Fixed damage, PB 1.2, Ele 0.2 → 1 Fixed, PB 1.1, Ele 0.15;
Level 2: 3 Fixed, PB 1.2, Ele 0.25 → 1 Fixed, PB 1.1, Ele 0.2;
Level 3 and 4: 3 Fixed, PB 1.3 → 2 Fixed, PB 1.2;
Midair Shot (after Walljump):
Level 3: 32 mv, 3 fixed, PB 1 → 22 mv, 1 fixed, PB 0.2;
Level 4: 35 mv, 5 fixed, PB 1, Ele and Status 1.2 → 29 mv, 2 fixed, PB 0.2, Ele and Status 1;

Light Bowgun, Heavy Bowgun
Clusters will now only blow up on their way down;
Super critical range will now be display;
Spread ammo splits into a wider area now;
Increased yield when crafting the following ammo types: Flaming, Water, Freeze, Thunder, Poison, Exhaust;
You can now carry fewer Bomberries;
Damage Changes:
Normal Lv3: 32 → 34;
Pierce Lv3: 8 → 9;
Sticky Lv2: 16 → 17;
Sticky Lv3: 19 → 24;
Cluster Lv1: 19 mv, Partbreak mod 1 → 17, Partbreak Mod 0.2;
Cluster Lv2: 22 mv, PB 1 → 20, PB 0.2;
Cluster Lv3: 26, PB1 → 28, PB 0.2;
Flaming: 27mv, 5 Fire → 22 mv, 8 Fire;
Water: 27 mv, 5 Water → 22 mv, 8 Water;
Freeze: 27 mv, 5 Ice → 22 mv, 8 Ice;
Thunder: 27 mv, 5 Thunder → 22 mv, 8 Thunder;
Wyvern Ammo (Secondary Hit): 16 → 19;
Wyvernheart Recharge: 0.20/s → 0.27/s;

Skill Changes:
Tool Specialist: 5/10/20% → 10/20/30%;
Non-Elemental Boost: 10% → 5%;
Heavy Artillery: 10/20% → 50/100%;
Agitator: Affinity: 3/6/9/12/15% → 5/5/5/5/10%;
Critical Eye: 3/6/10/15/20/25/30% → 5/10/15/20/25/30/40%;
Heroics: 5/10/15/20/30% → 0/5/5/10/15%;
Maximum Might: Effect only activates after a few seconds of max stamina, but also lingers for a bit after using stamina;

Source
World Data, aswell asIceborne Data

Yoinked from here.

Notable Changes:
Iceborne Release

Other Bugfixes:
Other miscellaneous bug fixes

Source

Notable Changes:
Longsword: Overhead Slash will now properly lead into foresight slash, rather than accidental Spirit Combo, again
Leshen/Ancient Leshen: Flash Pods while mounted no longer extend mount duration

Miscellaneous:
Spread 3 Heavy Bowgun no longer crashes the game when hunting Zorah Magdaros, again


Other Bugfixes:
Other miscellaneous bug fixes

Notable Changes:
Ancient Leshen

Miscellaneous:
Igni and Slinger shots are now more effective against Ancient Leshen's final phase

Other Bugfixes:
Fixed the replacement of auto-shoutouts with * symboles that started in the previous update
Other miscellaneous bug fixes

Notable Changes:
The Witcher 3 Event, Leshen
Longsword: Overhead Slash will now properly lead into foresight slash, rather than accidental Spirit Combo

Miscellaneous:
Spread 3 Heavy Bowgun no longer crashes the game when hunting Zorah Magdaros

Other Bugfixes:
Other miscellaneous bug fixes

Source

Notable Changes:
Arch-Tempered Kulve Taroth, rework of KT rewards
"Banquet of the Earthen Hall" replaced by "The Fury of El Dorado" Gunlance: Wyrmstake cannon no longer ticks on a monster that went underground

Other Bugfixes:
Several Localization fixes in several languages, notably: The KT Fire Dual Blades are now actually called Taroth Daggers "Fire"
Other miscellaneous bug fixes

Notable Changes:
Hunting Horn: jumping draw attacks off of ledges now properly store notes when slinger ammo is loaded
Lance: sliding charge→finishing twin thrust can now lead into counter thrust
Hiding behind Behemoths Meteors now works properly

Miscellaneous:
Guns: Jumping Reload Draw Attacks now proc Critical and Punishing draw even when ammo is not fully loaded

Other Bugfixes:
Reduced multiplayer lag on XBox one
Several Localization fixes in several languages
Other miscellaneous bug fixes

Notable Changes:
Lunastra Tickets rewarded from the event quest "When Blue Dust Surpasses Red Lust" are now actually materials
Arch-tempered Kushala's wind armor now repels arrows and bowgun shots as intended

Other Bugfixes:
Other miscellaneous bug fixes

Notable Changes:
Tempered Deviljho and Arch-tempered elder dragons now drop more Warped Feystones
Kulve Taroth exploit (intentionally disconnecting) fixed
Charge Blade: Damage-Cancelled Condensed Element Slash no longer makes the bonus phial tick carry over
Bow: Fixed the Dragon Piercer aiming bug, again
Critical Draw and Punishing Draw no longer get eaten by Torch Pods etc
The "Lightning Strikes Twice" quest will now properly appear

Miscellaneous:
Re-ordering of Elder Melder materials
Fixed a bug that deletes squad information if you switch between save files or refresh guild cards frequently

Other Bugfixes:
Focus Camera fixes
Many grammatical/spelling fixes and renaming of items and equipment in several languages
Other miscellaneous bug fixes

Source

Notable Changes:
Behemoth

Notable Changes:
Lunastra (and Teostra?) now in the pool for Threat Level 3 investigations

Miscellaneous:
Unspecified change for certain unspecified tempered elder investigations
Tempered Elder Dragon investigations reward now match the Standard of Vaal Hazak (previously biggest amount of bonus rewards)
Changed the standard Naming convention for Investigations to match the Japanese Convention, to include the Type and Target of the hunt Fixed mistakes in the Asian version regarding customer support information in Traditional Chinese and Russian

Other Bugfixes:
Other miscellaneous bug fixes

Notable Changes:
Lunastra, Temporal Mantle

Source

Miscellaneous:
Japanese, Asian, North American, European versions:
"Support" menu option added to title screen
European version:
"Privacy Policy" added to options menu

Notable Changes:
Kulve Taroth Siege no longer breaks by speaking to the Admiral
Wyvern Ignition now has 510 Fire as intended

Miscellaneous:
First Wyverian now gives Weapon Usage Statistics when spoken to

Source

Notable Changes:
Wyvern Ignition

Other Bugfixes:
Miscellaneous, unnamed bug fixes

Notable Changes:
Kulve Taroth

Source