Via [url=https://store.steampowered.com/news/225689/]the Steam store[/url]:

[quote=Valve]- Moved 64-bit Steam binaries to the correct folder
- Updated the equip_region for the Free Mann's Fashion
- Updated the Distant Drift Unusual effect to fix a visibility issue
- Updated the Butterfly Season Unusual effect to fix problems with the scale and effect trails
- Updated the Fiesta Royale and Grand Jubilee Unusual taunt effects with performance improvements
- Updated the Botler 2000 to fix problems with its positioning

- Updated koth_megaton
- Fixed the finale being cut off by a round ending too early
- Fixed players not being blown to smithereens during the finale
- Fixed players being able to get stuck in the edges of the thatch rooftops
- Improved optimization. Investigation into further improvements for lower-end and config users is ongoing.

- Updated cp_canaveral_5cp
- Fixed an out-of-bounds exploit
- Fixed some stuck spots
- Fixed some hovering props
- Added some missing overlays

- Updated cp_overgrown
- Fixed being able to build in RED spawn
- Adjusted clipping to fix a few perch points
- Removed extra shadow_control entity (Thanks Lacry!)
- Fixed a number of small visual and gameplay issues on the map (Thanks Midnite!)

- Updated pl_odyssey
- Fixed an exploit that allowed BLU players to enter RED spawn
- Fixed lighting issues in BLU first spawn[/quote]

Rumor has it:

- Size is close to 125 MB