Via [url=https://steamcommunity.com/games/TF2/announcements/detail/4520017657931497677]the Steam Community[/url]:

[quote=Valve]- Added missing list of authors for arena_lumberyard_event
- Fixed the Crook Combatant hiding the Scout's dog tags
- Fixed some sound script entries not playing because they were looking for .wav instead of .mp3
- Fixed BLU Scout using the incorrect team color pants
- Fixed some props_farm models using an incorrect surfaceprop setting
- Updated the large version of the backpack image for The Fast Learner to be consistent with the small version
- Updated the schema entries for The Hound's Hood and the Thrilling Tracksuit to remove unused settings
- Updated a couple of the community console images to fix missing nomip/nolod settings
- Updated Freaky Fair's expert contract to be "Win a round on Freaky Fair"
- Updated the Fleet Commander and Delldozer to fix import problems from the previous update

- Updated arena_lumberyard_event
- Fixed mini-crits being removed from the last player standing if they used the Crit-a-Cola
- Added missing navigation mesh
- Fixed areaportal windows in spawn fading in too early
- Fixed cases where players would get stuck on the setup doors
- Adjusted prop fades

- Updated cp_darkmarsh
- Lowered spell spawn timer (from 180 seconds to 120 seconds)
- Spells that spawn outside respawn rooms will disappear after 30 seconds of not being picked up
- Added several more pumpkin bomb spawn points
- Fixed portcullis doors turning pitch black when opening
- Lowered RED respawn wave time for the last point (from 10 to 8)

- Updated tow_dynamite
- Fixed an ammo pick-up differ on BLU side
- Added a missing wagon wheel on BLU side
- Added Tug of War objective strings
- Made the jump pad's deathpits deeper
- A new critter has arrived

- Updated pd_circus
- Fixed spell books being prompted despite none spawning in the map
- Reduced points per player from 6 to 5
- Reduced distracting lighting and details around the inaccessible areas of the circus
- Fixed being able to place teleporters too close to spawn doors
- Fixed erroneous collisions
- Fixed small displacements cutting through walls
- Fixed some gaps in geometry[/quote]

Rumor has it:

- Size is close to 110 MB