Via [url=https://steamcommunity.com/games/TF2/announcements/detail/5117770408326765721]the Steam Community[/url] and [url=https://store.steampowered.com/oldnews/89954]the Steam store[/url]:

[quote=Valve]- Fixed missing material and sound issues for the Taunt: Bare Knuckle Beatdown
- Fixed clipping issue for the Taunt: The Profane Puppeteer
- Fixed some sounds for the Taunt: The Mannbulance!
- Updated The Scariest Mask EVER with Hat/NoHat styles to prevent some clipping issues
- Updated the Wandering Wraith, Corpse Carrier, Beanie The All-Gnawing, and Computron 5000 to fix issues with the materials/models
- Updated the pickup/drop sounds for paintkits
- Updated/Added some tournament medals
- Updated the localization files
- Updated cp_ambush_event
- Fixed few exploits where players could get out of the map
- Fixed control point 2 base plate in stage 1 not turning blue upon capture
- Changed damage type from shock to bullet in underworld
- Improved clipping
- Updated pl_terror_event
- Fixed few exploits where players could get out of the map
- Increased spawn time interval of normal spellbooks
- Fixed visual issue during warmup period regarding track models floating in air
- Adjusted payload track select logic to fix rare issue with cart going off track
- Improved clipping
- Updated koth_los_muertos
- Fixed a respawn visualizer not showing up on the RED side
- Fixed falling off the edge when entering the Land of the Dead with higher than normal movement velocity. Now when entering the portal, player speed will be set to 0.
- Fixed being able to spam grenades and rockets through rooftops
- Updated arena_lumberyard_event
- Fixed missing beacon particle to signify rare spell spawn locations
- Fixed an issue with custom HUDs interfering with the map's own HUD
- Fixed middle doors shutting themselves when blocked by a player
- Fixed various props z-fighting inside of walls
- Fixed instances of the announcer lines playing over the Merasmus' announcer lines
- Fixed an issue that caused players to remain in third-person at the beginning of a new round
- Fixed spells dropped by the skeleton king persisting between rounds
- Fixed pumpkin bombs generated from spells persisting between rounds
- Fixed server lag caused by dynamic props
- Reworked various VO to use new soundscript entries
- Merasmus will now react to player deaths with varying degrees of sarcasm
- Pumpkin bombs will now all refresh simultaneously at the start of every round
- Added a "No entry" sign to the middle doors
- Smoothed surfaces around the map to ease flying around as a ghost
- Increased sound of the ghost dispenser to improve healing feedback
- Extended the warmup periods by 5 seconds (now 15 seconds)
- Nature & Wildlife preservation measures
- Removed the Observer[/quote]

Rumor has it:

- The Corpse Carrier's item type name is now [url=https://github.com/SteamDatabase/GameTracking-TF2/commit/d3596b2edba0c01cef13a9047831210d96069cfd#diff-5d59463cc2ec4526db586d010e16ea0a70a21347828fd104d36bb7659aef183dR99104]"Good Samaritan"[/url] (and [url=https://github.com/SteamDatabase/GameTracking-TF2/commit/d3596b2edba0c01cef13a9047831210d96069cfd#diff-01ba957b0f0d55d164301650591ac7b823c999924daeb46879eaef57f9646731R2866]here is the associated string addition to make that item schema tweak work[/url])

- [url=https://github.com/SteamDatabase/GameTracking-TF2/commit/d3596b2edba0c01cef13a9047831210d96069cfd#diff-5d59463cc2ec4526db586d010e16ea0a70a21347828fd104d36bb7659aef183dR158071]Tournament medal additions[/url] are as follows:
- MidNight Moon 2021 (Gold, Silver, Bronze, Participant, Staff)
- Newbie Highlander Cup Season 6 (Gold Medal, Silver Medal, Bronze Medal, Participant)
- Newbie Prolander Cup Season 6 (Gold Medal, Silver Medal, Bronze Medal, Participant)

- Map logic updates and localization file updates [url=https://github.com/SteamDatabase/GameTracking-TF2/commit/d3596b2edba0c01cef13a9047831210d96069cfd]both can be viewed here[/url], the latter of which in particular is made possible through the combined efforts of [url=https://translation.steampowered.com/]Translators Like You - Thank You[/url]

- Size is close to 150 MB