Via [url=https://steamcommunity.com/games/TF2/announcements/detail/3050618730214749106]the Steam Community[/url]:

[quote=Valve]- Fixed the description for the World Traveler's Hat not supporting all of the community maps at the same time
- Updated The Missing Piece and The Mislaid Sweater to fix issues with the materials/models
- Updated Mann vs. Machine
- Added checks to prevent loading an invalid .pop file
- Fixed several .pop file references from "Witch Hat" to "Point and Shoot"
- Updated cp_ambush_event
- Fixed an out of the map exploit
- RED team now respawns on stage 2 after the 1st point has been captured
- Improved clipping
- Nature & Wildlife preservation measures
- Updated koth_synthetic_event
- Fixed a location where teleporters could trap players outside of the map
- Minor lighting changes
- Detail changes to make things more cohesive
- Updated color on BLU barrels
- Fixed some console errors
- Updated pd_farmageddon
- Minor lighting changes to brighten up a few spots
- Updated .nav mesh to fix scarecrows not chasing players
- Minor detail changes
- Updated announcer lines so they are easier to hear
- Removed general damage in the capture area while the point is unlocked[/quote]

Rumor has it:

- Size is close to 150 MB