Via [url=https://steamcommunity.com/games/TF2/announcements/detail/517475198366122284]the Steam Community[/url]:

[quote=Valve]- Added missing style for the One-Man Convoy
- Fixed regression in vbsp
- Fixed broken styles for the Professor Photon
- Renamed Feathered Villain to Feathered Foe
- Updated the Pyromantic Plumage to fix a clipping problem
- Updated the backpack image for the Fused Plates

- Updated arena_afterlife
- Fixed the bug that caused the round to never end
- Fixed some of the default announcer lines not being replaced with the Devil

- Updated koth_dusker
- Lighting and fog adjustments
- Fixed displacement seam
- Fixed perch spot on blue mountain
- Fixed being able to build in the death pit
- Adjusted timing of voicelines

- Updated sd_marshlands
- Reduced pumpkin bomb amount
- Removed spell pickup from the mid shack
- Adjusted trigger_push speed on top of the bridge
- Reduced respawn time[/quote]

Rumor has it:

- Size is ~40 MB