Patch 1.12

 for The Witcher 3: Wild Hunt by CD Projekt RED was released on January 11th, 2016. On Steam, it is a 630.6 MB-sized download.

Gameplay

 * Fixes issue whereby some toxic gas clouds failed to poison or deal damage to player character.
 * Fixes issue whereby scabbard meshes were missing from witchers other than Geralt.
 * Fixes rare issue whereby attacks performed near friendly NPCs resulted in unintended regeneration of Stamina.
 * Fixes exploit involving Alchemy skill titled Tissue Transmutation.
 * Fixes issue whereby quickslots could disappear if game difficulty level was changed during combat.
 * Fixes exploit involving Superior White Raffard's Decoction and skill named Delayed Recovery.
 * Fixes rare issue whereby skill named Flood of Anger incorrectly enabled Signs Tree and enhanced Sign Intensity permanently.
 * Introduces fix whereby special bonus granted by Superior Blizzard will take effect only when slow-motion is triggered.
 * Fixes a number of issues affecting potion called Chort decoction.
 * Fixes rare issue whereby some mini-bosses could become immortal under certain circumstances.
 * Fixes misleading message displayed when players attempted to cast Signs in combat, while enveloped by a cloud resulting from the detonation of a Dimeritium Bomb.

UI

 * Fixes issue whereby items in merchants' stores could not be compared to currently equipped items.
 * Fixes exploit whereby some items (runes, glyphs) could be upgraded infinitely.
 * Introduces UI enhancement whereby herb name is now displayed above available interaction.
 * Fixes issue whereby keys/controls (mouse and keyboard) were not unbound from current setting when attempted.
 * Fixes issue whereby Toggle HUD button would not always work correctly during set scenes.
 * Introduces enhancement whereby ingredients required for a pinned formula and in possession of a merchant are now highlighted in said merchant's Shop screen.
 * Improves quest tracking by enabling tracking of objectives across different game regions.
 * Fixes issue whereby Witcher Medallion and statistics bar could disappear if game difficulty level was changed during combat.
 * Introduces enhancement on PC systems whereby weapon and armor repair kits can now be applied via drag and drop.
 * Fixes issue on PC systems whereby toggling HUD did not work correctly on QWERTZ and AZERTY keyboard configurations.

Living World

 * Fixes issue whereby treasure hunt titled Shortcut would not complete correctly.
 * Fixes issue whereby destroyed monster nests would respawn after a time.
 * Fixes rare issue whereby Shop screen would not open correctly for traveling merchants.
 * Fixes issue whereby NPCs failed to return to abandoned settlement named Ruined Inn.

Quests

 * Fixes issue whereby some human foes could have empty Vitality bars and thus could not be killed.
 * Fixes rare issue whereby some players could not talk to Fergus during quest titled Master Armorers.
 * Fixes rare issue whereby a monster disappeared incorrectly during quest titled Contract: Phantom of the Trade Route.
 * Restores notice regarding quest titled Races: Crow's Perch to notice board at said ingame location.
 * Fixes premature display of objective involving placement of a book on a pedestal in quest titled The Witchers' Forge.
 * Fixes rare issue whereby relevant reward was not granted for completion of Contract: The Creature from the Oxenfurt Forest.
 * Fixes issue whereby encounter with caged wyvern near Oxenfurt was inactive.
 * Fixes a number of rare issues with blacksmith in Mulbrydale in quest titled Person in Distress.
 * Fixes issue whereby quest titled Novigrad, Closed City II would incorrectly be tagged as failed if completed prior to installation of patch 1.10.
 * Introduces balance improvement whereby prices of goods throughout Skellige drop by 10% after Geralt kills the giant and agrees to take all the credit for it in quest titled The Lord of Undvik.
 * Fixes issue whereby quests titled The Nobleman Statuette and The Soldier Statuette were incorrectly and prematurely deactivated and could not be completed.
 * Fixes incorrect map-pin in treasure hunt titled Freya Be Praised!
 * Fixes rarely occurring technical glitch whereby older patch fixes failed to work correctly.
 * Fixes rare issue whereby players could not talk to Hattori after completing quest titled Of Swords and Dumplings.
 * Fixes rare issue whereby Nidas would fail to appear in Novigrad during quest titled Black Pearl.
 * Fixes issue whereby treasure hunt titled Temerian Valuables would not complete correctly.
 * Fixes rare issue whereby quest titled Get Junior would remain active in Journal after game was completed.
 * Fixes issues whereby some Character glossary entries were displayed incorrectly in game.
 * Fixes issue whereby quest titled Free Spirit could not be completed.

Visual

 * Fixes appearance on screen of unwanted visual artifacts after Geralt was teleported to new locations.
 * Improves transitions between distinct scenes and gameplay sequences.

Code
Fixes issue whereby launching The Witcher 3 on systems running the Windows OS discarded sRGB settings in users' ICC profiles.

Other

 * Fixes rare issue whereby NPC animations would playback at reduced speed after quest titled On Thin Ice.
 * Fixes issue whereby quest titled Faithful Friend would incorrectly remain tagged as failed after quest titled Something Ends, Something Begins was completed.

Hearts of Stone changes

 * Fixes issue whereby achievement titled Wild Rose Dethorned could not be completed.
 * Fixes interaction on pickaxe in quest titled Enchanting: Quality Has Its Price.
 * Fixes issue (in majority of contexts) whereby not all diagrams could be collected in quest titled From Ofier's Distant Shores.
 * Fixes rare issue whereby some players were prevented from spreading smoke throughout all rooms in crypt during quest titled Dead Man's Party.
 * Fixes issue whereby book merchant named Marcus T.K. Hodgson failed to appear in market square in Novigrad.
 * Fixes rare issue whereby some Knights of the Flaming Rose in quest titled Open Sesame! in Hearts of Stone expansion could not be killed.
 * Introduces a number of improvements to general game performance.
 * Fixes issue whereby treasure hunt titled The Drakenborg Redemption remained in Journal despite completion of all objectives.
 * Fixes issue whereby swapping of enchanted gear within Inventory granted permanent bonuses to statistics.
 * Fixes issue whereby treasure hunt titled The Royal Air Force remained in Journal despite completion of all objectives.
 * Fixes issue whereby players could not eavesdrop on guards during quest titled Witcher Seasonings in Hearts of Stone expansion.
 * Fixes issue whereby some players could not talk to Shani at certain juncture of quest titled Dead Man's Party in Hearts of Stone expansion.
 * Introduces a series of minor difficulty balance tweaks at all difficulty levels in Hearts of Stone expansion.
 * Fixes rare issue whereby inebriation effect would persist on screen after quest titled Dead Man's Party in Hearts of Stone expansion.
 * Fixes issue whereby phase titled Enchanting: Start-up Costs would remain in Journal after Enchanter was paid relevant amount.
 * Fixes incorrect Stamina bonus granted for Caparison of Lament in New Game + mode.
 * Fixes incorrect mesh appearing on Viper School swords in New Game + mode.

DLC changes

 * Fixes previously unlootable container within Kaer Morhen watchtower during quest titled Scavenger Hunt: Wolf School Gear.
 * Fixes rare issue whereby a doll could not be picked up in quest titled Where the Cat and Wolf Play.
 * Fixes specific user's issue with werewolf in quest titled Contract: Skellige's Most Wanted.