Official Patchnotes as published by Capcom.
Source for Motion Values (dltnor)

Notable Changes:
Removal of Event Quests: Gotta Hoard Fast!, Super Shady Look-alike, USJ - Shrine Showdown!, USJ - Arzuros Onslaught!;
Removal of downloadable Palico: MEOW LIMIT!, Yasu;
Removal of "Receive Promotional Content" option.
Already downloaded content not affected.

Other Bugfixes:
Other miscellaneous bug fixes

Source

Notable Changes:
--

Miscellaneous:
--

Other Bugfixes:
Multiplayer is now no longer disabled during specific (unnamed) circumstances
Other miscellaneous bug fixes

Source

Notable Changes:
Bow: Blood Awakening doesn't overflow element damage to 0 anymore
During Amatsu hunts, the second monster will now spawn properly

Other Bugfixes:
Armor Spheres are no longer deleted when forging specific decorations
Other miscellaneous bug fixes

Source

Notable Changes:
Primordial Malzeno, final ending added
Added Slot+ Augment
Frenzied Bloodlust can now roll on charms and qrafts
Held investigation cap raised to 200
Fixed "netplay" bug (host generated more aggro)

Miscellaneous:
New Decoration from lottery
Bahari has more ware (if you have coin)
New titles, badge of heroes, npc dialogue
Can now flip through Smithy deco pages by holding L/R
Blocking someone on steam now actually prevents them from being able to join your lobby/quest

Other Bugfixes:
Miscellaneous minor, mostly unspecified, bugfixes

Source

Notable Changes:
Lance Gust Crab Guard Dash Rampage Deco tech "fixed" (removed)
Getting hit during the "Quest Complete" animation no longer softlocks you

Other Bugfixes:
Other miscellaneous bug fixes

Source

Notable Changes:
Released Amatsu and Risen Shagaru
Anomaly Level cap is now 300, added Special Investigations
Velkhana, Risen Crimson Glow Valstrax and Risen Shagaru Magala now have Anomaly Investigations
Anomaly Investigations can now have the Arenas as locales (Starting April 28, 2023)
Added the following Skills to the Qurious Crafting Pool: Dragon Conversion, Frostcraft
Berserk can now roll on charms
Added an additional Talisman melding option
You can now filter by reward material in the Anomaly Investigation Menu
Equipment Loadout pages increased to 28
Catch-Up Mechanic for Anomaly Ranks 1-220, with 1-120 getting another boost

Weapon Changes:
Greatsword:
Adamant Charge Slash Level 0/1: 78→86
Level 2: 108→120
Level 3: 138→152;
Falling Slash 1: 48→58, elemod 1→1.3
Falling Slash 2: 86→95, elemod 1.05→1.4
Falling Slash 3: 110→121, elemod 1.2→1.8;
Vortex Slash 1: 28→34, elemod 1.2→1.6
Vortex Slash 2: 55→66, elemod 1.6→2
Rising Slash 1: 28→34, elemod 1.2→1.6
Rising Slash 2, 1st hit: 55→66, elemod 1.6→2
Rising Slash 2, 2nd hit: 20→24, elemod 1.1→1.4
Rising Slash 3, 1st hit: 55→61, elemod 2→3
Rising Slash 3, 2nd hit: 60→66, elemod 2→3
Rising Slash 1: 35→42, elemod 1→1.3
Rising Slash 2: 65→78, elemod 1→1.3
Rising Slash 3: 48→53, elemod 1→1.5
Rising Slash 3, 2nd hit: 80→88, elemod 1→1.5
Rising Slash 2 (Parry 1→Falling Slash 2): 86→95, elemod 1.05→1.4
Vortex Slash 3 (Parry 2→Vortex Slash 3): 55→61, elemod 2→3
Running→Falling Slash 1: 48→58, elemod 1→1.3
Vortex Slash 3 (Overhead Slash 2→Wide Slash 3, second half): 55→61, elemod 2→3
Wide Slash 2→Wide Slash 3: 55→61, elemod 2→3
Rising Slash 2 (From Overhead Slash 1): 65→78, elemod 1→1.3
Vortex Slash 3 (After triggering Strongarm Stance): 55→61, elemod 2→3
More Damage Reduction while charging Rage Slash

Sword and Shield:
Jumping Slash now combos into Roundslash instead of Rising Slash

Dual Blades:
Lunging Strike R,L: 3→4
Lunging Strike Finish R,L: 5→6, elemod 0.7→1
Demon Flurry Rush 1st R,L: 5→6, elemod 0.7→1
Demon Flurry Rush 2nd R,L: 4→5, elemod 0.7→1
Demon Flurry Rush Finish R,L: 8→10, elemod 1→1.2

Hammer:
Charged Big Bang, 1st hit: elemod 1→1.2
Charged Big Bang, 2nd hit: elemod 1→1.5
Big Bang 1, 2, 3, 5: elemod 1→1.2
Big Bang 4: elemod 1→1.5
Big Bang Finisher, 1st and 2nd hit: elemod 1→1.2
Big Bang Finisher: elemod 1→2

Hunting Horn:
Silkbind Shockwave duration: 30s→45s
Sonic Barrier now has damage reduction

Longsword:
Harvest Moon radius increase from 15m to 20m and reduced the cooldown
Sheathing no longer cancels Harvest Moon
The circle is now displayed at a slightly higher position and does no longer knock back players touching it

Insect Glaive:
More Attack when all 3 colors active, exact value unclear
Kinsect Stamina increased

Lance:
Anchor Rage duration 20s→30s
Gunlance:
Full Burst, wide only:
Lv 4: 36→45; Lv 5: 44→58; Lv 6: 50→68; Lv 7: 56→78; Lv 8: 62→90
Erupting Cannon Explosion, wide only:
Lv 4: 110→121; Lv 5: 120→138; Lv 6: 130→156; Lv 7: 140→168; Lv 8: 150→180
Shelling, wide only:
Lv 4: 39→45; Lv 5: 48→58; Lv 6: 54→68; Lv 7: 60→78; Lv 8: 66→90
Charged shelling, wide only:
Lv 4: 50→65; Lv 5: 62→83; Lv 6: 78→97; Lv 7: 87→112; Lv 8: 95→130
Strong Charged Shelling, Wide only:
Lv 4: 72→87; Lv 5: 86→112; Lv 6: 106→132; Lv 7: 118→152; Lv 8: 129→176
Wyrmstake:
Normal Lv 4: 16→18; Lv 5: 18→21; Lv 6: 20→24; Lv 7: 22→27; Lv 8: 24→30
Long Lv 4: 16→21; Lv 5: 18→27; Lv 6: 20→32; Lv 7: 22→40; Lv 8: 24→48
Wide Lv 4: 94→113; Lv 5: 100→125; Lv 6: 105→137; Lv 7: 110→149; Lv 8: 115→161
Explosion, Wide Lv 4: 110→121; Lv 5: 120→138; Lv 6: 130→156; Lv 7: 140→168; Lv 8: 150→180

Miscellaneous:
Miscellaneous:
Level cap for armor raised
More decorations from Lottery, new npc dialogue, new titles, new badge of heroes, special invest entry on guildcard
Bahari has more ware (if you have coin)
Menu improvements for Decorations/Wishlist
Added Latin American Spanish to the text options (Starting April 28, 2023)
Hitbox fixes

Other Bugfixes:
Other miscellaneous bug fixes

Source

Notable Changes:
New monsters: Velkhana and Risen Crimson Glow Valstrax
Chaotic Gore can now be afflicted, Risen Chameleos, Kushala and Teostra now have Investigations
Anomaly level cap raised to 220
Armor level cap raised
The following skills were added to the qrafting pool: Mail of Hellfire, Strife, Wind Mantle, Powder Mantle, Dreagonheart, Embolden and Intrepid Heart
Weapon Slot Augments now grant bonus Raw, Element or Status (if applicable, more raw if not) and Sharpness.
Bullet Barrage can no longer be executed from Lunging Upthrust → Quick reload if you only have 1 Wirebug
Crouching Shot now only shoots once per button input

Miscellaneous:
Any anomaly investigation (within the specified level range) now counts towards Bahari's Requests and have a lower level requirement
Hunting the specific target of a request now grants 2 points toward Bahari's Request
Somnacanth can now spawn in the lava caverns
Azure Star Dragon Dance and Azure Era Soaring Dragon are now available as layered weapons
New decorations from the lottery
Bahari has more ware (if you have coin)
Added Hunter Loadouts; 14 now and an additional 14 in a later update
You can now disable the markets Sale BGM at the housekeeper
Added new Guild Card Titles and a new badge of heroes
Added 3D audio option
Cut Tails on the fence switch in the Arena can now be carved, again
Renamed Zinogre LS from Opressor's Abyss to Opressor's Law

Other Bugfixes:
Other miscellaneous bug fixes
Russian: Afflicted Direbone and Afflicted Dire Hardbone got renamed (previously they shared a name)
Arabic: The Photosensitivity warning on launch has been updated
miscellaneous other fixes, mostly unnamed

Source

Notable Changes:
When creating new save data, the default cursor position is now "No"

Miscellaneous:

Other Bugfixes (August 6, 2021):
Other miscellaneous, unnamed bug fixes and balance adjustments

Source

Notable Changes:
Released Chaotic Gore, Risen Kush and Risen Teostra
New decos: Redirection 2, Kushala Bless 1, Teostra Bless 1, Focus 2, Grinder (s) 2, Sneak Attack 1, Element Exploit 1, Adrenaline Rush 1, Offensive Guard 2, Tune-Up 2, Blood Rite 1
Flaming Espinas, Gold Rathian, Silver Rathalos, Seething Bazelgeuse, Scorned Magnamalo and Furious Rajang now have afflicted versions
Anomaly Research now capped at 200
Can now "downlevel" anomaly quest
Armor Level Cap raised
Gunlance: added Shelling upgrade weapon augment
Added the following Skills to the qrafting Pool: Bloodlust, Buildup Boost, Status Trigger, Furious, Adrenaline Rush, Chameleos, Teostra and Kushala Blessing, Sneak Attack, Blood Rite, Guts, Elemental Exploit
New qrafting options: Skill+ and Stability (def/res focused, therefore useless)
Followers can now join for every non-event quest
Followers buffed when they use the following weapons: GS, LS, SnS, DB, Hammer, Lance, GL, Swaxe, CB, IG, LBG, HBG, Bow
Gundog nerf, most other options buffed, notably: chaindog
Catchup Mechanic: Anomaly Investigations from level 1 to 120 now give bonus points

Motion Value and Elemod changes:
Dual blades:
Spiral Slash:
Loop 4→5;
Finisher Before Hit L, R 6→8, elemod 1.1→1.2;
Finisher Hit L, R 12→13; elemod 1.1→1.2
In demon mode:
Loop: 6→7
Finisher Before Hit L, R 8→10, elemod 1.2→1.4
Finisher Hit L, R 20→21, elemod 1.2→1.4

Hammer:
Spinning Bludgeon:
Elemod on everything: 0.7→1;
Everything: 25→35
Dash Breaker:
Charge 1: 50→60
Charge 2: 60→72
Charge 3: 70→85

IG (kinsect):
Enhanced Kinsect
Normal, Sever: LV1 28→34, LV2 39→47, LV3 50→63;
Normal, Blunt: L1 18→22, LV2 27→32, LV3 36→45;
Speed, Sever: LV1 32→38, LV2 34→41, LV3 40→50;
Speed, Blunt: LV1 22→26, LV2 27→32, LV3 32→40;
Powder, Sever: LV1 32→40, LV2 34→43, LV3 40→54;
Powder, Blunt: LV1 22→28, LV2 27→34, LV3 32→43;
Assist, Sever: LV1 25→30, LV2 50→60, LV3 76→95;
Assist, Blunt: LV1 24→29, LV2 42→50, LV3 60→75;

SNS: Destroyer Oil now restores some sharpness

Gunlance:
Groundsplitter: Buff lasts longer, Wirebug recovers faster, damage reduction and blowback negation now consistent
Hail Cutter: Costs only 1 bug now, recovery speed now medium

Hunting Horn: Sharpness Extension melody now restores some sharpness

Heavy Bowgun:
Intrepid Heart no longer triggers on successful counter
Crouching Shot:
Overheat is now shorter
Normal 1-3, Pierce 1-3, Fire Water Ice and Thunder ammo shoot faster and more total shots
Dragon and Piercing Dragon ammo and Status ammo 1-3 now shoot faster

Miscellaneous:
New decoration from the Lottery
Implemented option to "customize" Follower Wyvern Riding and item use behaviour
New guild card titles and badge of heroes
Excess points when qrafting now converted to essence and returned
Bowgun ammo combo materials now part of the Trade Goods lineup at the Argosy, also yield more results when farming them under "Order Items"
Bahari has more ware (if you have coin)

Other Bugfixes:
Other miscellaneous bug fixes
Greatsword: SAS→TCS no longer buffs damage of Large Barrel Bombs hit with it
Sword and Shield: Roundslash input after Rising Slash now actually performs Roundslash
Intrepid heart now properly works on DB and Hammer
December 2, 2022: miscellaneous text fixes
December 16, 2022: miscellaneous text fixes

Source

Notable Changes:
Risen Chameleos no longer behaves differently depending on Anomaly Level (sub 100, 100+)
Violet Mizu no longer looses it when you use a Tricktoad
Joining unauthorized/certain modded Anomaly Investigations now labels them as such in the chatlog upon joining

Miscellaneous:
Game no longer autosaves before cutscenes

Other Bugfixes:
Other miscellaneous bug fixes

Source

Notable Changes:
New afflicted mons: There will be a ton of new Afflicted Monsters like Gore Magala, Espinas, Bazelgeuse, Pyre Rakna-Kadaki, Rajang, A6★ Anomaly Quests.
Anomaly Level Cap raised to 120
new mons: Violet Mizu, Flaming Espinas, Risen Chameleos
Notable new decos: Coalescence 1 and 2, Maximum Might 2, Chameleos Blessing 1, Burst 1
Rampage Deco: Bloody Heart (r2)
Layered weapons
You can now display or hide items like whetstone, bbq spit and throwing kunai
Charge Blade: Shield Thrust → AED is now easier, whatever that means
Heavy Bowgun: Spamming buttons no longer increases fire rate in Crouching Shot

Miscellaneous:
Fugen's endemic life will no longer hit you
Turf wars between Scorned and Teo, Kush or Bazelgeuse will no longer sometimes deal double damage
Fixed some specific parts of some monsters AI
You can now have up to 8 radial menu loadouts
Prime Amber Essence renamed to Amber Essence+ Steam only:
Achievements from TU1 now obtainable
TU2 achievements will be implemented in TU3

Other Bugfixes:
Unspecified text updates on October 5 and October 10, 2022
Other miscellaneous bug fixes

Source

Notable Changes:
Qrafting results can no longer be changed by looking at Weapon Augments


Miscellaneous:
More paid DLC for the eShop

Other Bugfixes (August 6, 2021):
Other miscellaneous bug fixes
Body hair now actually displayed when AA is turned off or set to FXAA, aswell as when DLSS is enabled (starting August 10 2022)
Source

Notable Changes:
Added: Seething Bazelgeuse, Gold Rathian, Silver Rathalos, Lucent Nargacuga
Added Decos: Foil 3 (tune up 1), Artillery 2, Quick Sheathe 2, Prot Pol 2, Razor Sharp 2, Rapid Morph 2, Steadiness 3, Grinder(s) 1, Charge Master 1,...
Added Anomaly Investigations, level cap 100
Added Forlorn Arena
Bahari (has ware if you have coin)
Added Qrafting
Beams no longer go through walls
Fixed the MP Accelerant inputs
Locked Talismans no longer on the top of the list in melding menu
Can no longer change Melding results by performing certain (unspecified) inputs
Fixed Grinder (S) duration bug

Miscellaneous:
New Titles, guild card awards and auto-shoutouts
Added option to display Badge of Heroes next to name
Sakura Slash no longer blinds you if you don't want it to
Charge Blade: RM now affects Axe: Smash from sheathe
More paid DLC for the eShop

Steam Only:
New Achievements
TU1-specific achievements will be added in tu2

Other Bugfixes:
Miscellaneous Monster AI and movement fixes
Wyvern Riding is no longer PVP
Other miscellaneous bug fixes

Source

Notable Changes:
Sunbreak/Master Rank release, including:
Citadel, Jungle
Switch Skill Loadouts, Scroll Swap mechanic, Rampage Decorations instead of tree-dependant Rampage Skills, new Switch Skills and combos
Notable Decorations: Wirebug Whisperer 2, Guard Up 2, PowPro 2, Crit Ele 2, Focus 2, Ele Attack 2 and 3, most Rampage Decos, Stamina Skills, Guard 2, ...
New Monsters: Magma Almudron, Astalos, Blood Orange Bishaten, Daimyo Hermitaur, Espinas, Gaismagorm, Garangolm, Gore Magala, Lunagaron, Malzeno, Furious Rajang, Pyre Rakna-Kadaki, Seregios, Shagaru Magala, Shogun Ceanataur, Aurora Somnacant;
New Melding options
New Pet skills
You can now turn off auto-mount on hit
NPC-Followers in specific solo-only quests
Hopping Skewers
Weapons: Lots and Lots of changes, additions and bugfixes

Miscellaneous:
New Decorations from Lottery
Talisman Lock option and more space in Item and Equipment box
New Guild Card Awards, titles
You can now wall-run without using wiredash first
Drinking potions can now be cancelled
Mounting Doggo is now faster
Morphed Wirebugs (Red, Gold)
Updated Menus
Smithy menu: cursor now loops back horizontally and vertically
Argosy now has a black market for pets
Talismans can now be locked
Unusable Ammo and Phials in item loadout is marked with a red X now
You can now lower other players hit effects
More paid DLC for the eShop

Steam Only:
Classic filter
New Keyboard and Controller Settings
Ultra-Wide and Nvidia DLSS support
Razer Products now supported

Other Bugfixes:
Unspecified text fixes (June 22, 2022)
Barroth: Hitbox adjustment
Rakna: Ammo HZV adjustments
Miscellaneous hitbox and hit detection fixes
Large Monsters don’t hard-focus small mons anymore
Monsters no longer spam their taunt
Other miscellaneous bug fixes

Source

Yoinked from here.

Notable Changes:
Weekly Event quests (of debatable impact), the final one on March 25

Miscellaneous:
More paid DLC for the eShop

Other Bugfixes (August 6, 2021):
Other miscellaneous bug fixes

Source

Notable Changes:
Weekly Event quests (of debatable impact)

Miscellaneous:
More paid DLC for the eShop

Other Bugfixes:
Rampage Twinblades 1 no longer bend the wrong way around when sharpened.
Wyvern's Fire no longer bends other hunters the wrong way around in multiplayer
Other miscellaneous bugfixes

Source

Notable Changes:
Weekly Event quests (of debatable impact)
Monsters will now actually fall properly

Miscellaneous:
More paid DLC for the eShop
Add-On content now is advertised on the Title Screen and the Courier Cat, but can be turned off under options→promotion
Some Korean, Simplified Chinese and Traditional Chinese text will now be displayed in a calligraphy font


Other Bugfixes:
Other miscellaneous, unspecified bugfixes

Source

Notable Changes:
Weekly Event quests (of debatable impact)
Monsters hit by a Blastoad or a vent in the Lava Caverns will now actually topple instead of just flinch

Miscellaneous:
More paid DLC for the eShop


Other Bugfixes:
Miscellaneous, mostly unnamed, bugfixes

Source

Notable Changes:
Weekly Event quests (of debatable impact)
New Gyro Correction function
Unspecified Crit/Punish Draw fix
Greatsword: Fixed Rage Slash reset timing that was introduced in Ver 3.4.1


Miscellaneous:
More paid DLC for the eShop

Other Bugfixes:
Other miscellaneous, unnamed, bugfixes

Source

Notable Changes:
Weekly Event quests (of debatable impact)
Monsters no longer take double poison damage
Sword and Shield: Falling Bash now leads into Backstep instead of Roundslash
Gunlance: You can now perform Aerial Burst after dodging off a ledge


Miscellaneous:
More paid DLC for the eShop

Other Bugfixes:
Other miscellaneous bugfixes

Source

Notable Changes:
Weekly Event quests (of debatable impact)
Flashing a flying, fire-breathing Teostra now actually falls instead of just teleporting to the ground
Monsters turning towards you will now actually turn towards you
Greatsword: damage received during Rage Slash no longer carries over to other moves
Hammer: you can no longer ledge-cancel Impact Crater
Switch axe: hitstop is no longer the reason for auto-cancelled zsd
Charge Blade: Landing on a ledge no longer cancels Axe Hopper → (S)AED
Insect Glaive: Kinsect will now track monster instead of the position it was at at time of launch


Miscellaneous:
Can no longer cancel "tired running" animation by gathering items


Other Bugfixes:
Other miscellaneous, mostly unnamed, bugfixes

Source

Notable Changes:
Weekly Event quests (of debatable impact)

Miscellaneous:
More paid DLC for the eShop

Other Bugfixes (August 6, 2021):
Arena 06: Vents no longer appear in random places, but in fixed locations
Large Bombs no longer automatically blow up immediatly upon being placed
Longsword: Spirit Step Slash into Spirit Blade 3 / Dividing Slash now consumed the correct amount of gauge
Game no longer waits for input after Iai Spirit Slash
You can now actually attack Magnamalo's forelegs (instead of its torso)
Dual Blades: Heavenly Blade Dance damage does no longer decrease after "certain number of" consecutive hits
Gunlance: direction input after Ground Splitter will now actually work
Bow: Bubbly Dance now applies even if you attack immediatly after a dodge
Other miscellaneous, mostly unknown, bugfixes.

Source

Notable Changes:
Weekly Event quests (of debatable impact)
Arabic Language Support
Apex Mizu is now no longer able to beam when in toppled state


Miscellaneous:
More paid DLC for the eShop

Other Bugfixes:
Hunting Horn: Melodies no longer activate when using Magnificent Trio
Charge Blade: You can now Sword: Morph Slash after dodging in sword mode
After dodging in sword mode and without using the left stick, Forward Slash is now performed instead of Return Stroke
Other miscellaneous, partially unknown, bugfixes

Source

Notable Changes:
New monsters: Crimson Glow Valstrax, Allmother Narwa, Apex Zinogre
Infernal Springs released
"New Ending" - Allmother
Final upgrades for the following weapon trees:
Mizutsune, Rajang, Tigrex, Teostra, Kushala, Chameleos, Ibushi, Narwa, Rampage

Miscellaneous:
Pseudo-Layered weapons for Rampage Weapons only
New Guild Card Awards
New DLC in the eShop

Other Bugfixes:
Miscellaneous bugfixes

Source

Notable Changes:
Hunter Rank Cap removed
New Monsters: Elder Trio (Chameleos, Kushala, Teostra), Apex Diablos, Apex Rathalos, Bazelgeuse
Magnamalo can now appear in Rampages
Apex Arzuros, Apex Rathian and Apex Mizutsune now have stand-alone quests
Armor Upgrade Cap raised
New decorations, notably: Wex (2), Crit Boost (2), Master's Touch (2), Agi (2), Peak Performance (2), Resentment (2), Protective Polish (2), Razor Sharp (2), Handicraft (3), Normal/Pierce/Spread up (3), Spare Shot (2), Rapid Fire Up (3)
Wisp of Mystery producing same charms (Gout/Sasuke Tables) fixed

Miscellaneous:
Layered Armor for Hunter and Pets
Pet level cap raised to 50
New Guild Card Awards
Introduction of Character Edit Voucher
Character Edit Vouchers can now be bought in the eShop
Additional (unspecified) DLC available in the eShop

Other Bugfixes:
Miscellaneous, mostly unspecified bugfixes

Source

Miscellaneous, mostly unspecified bugfixes.

Source

Access to pre-order bonuses and amiibos.
Miscellaneous, unspecified bugfixes.

Source