Via [url=https://steamcommunity.com/games/TF2/announcements/detail/5702151139889274977]the Steam Community[/url]:

[quote=Valve]- Fixed Particulate Protector not using the BLU team skin
- Fixed Huntsman registering headshots when arrows go through other entities
- Fixed Oktoberfester's third style using the smoke effect
- Fixed missing smoke effect for The Salty Dog's second style
- Updated Tainted Frost unusual effect to fix a problem with the material
- Updated Colonel Kringle to fix some clipping and alignment issues
- Updated Taunt: Tailored Terminal to fix a problem with the briefcase materials
- Updated Taunt: Russian Rubdown to fix some sounds being clipped
- Updated Taunt: Roasty Toasty
- Fixed some sounds clipping the Pyro's lines
- Fixed some missing particles
- Fixed a stutter in the animation loop

- Updated pl_rumford_event
- Fixed missing materials/models
- Fixed duplicate lights on the rope entities

- Updated cp_gravelpit_snowy
- Fixed a client crash caused by failing to decode MP3 files
- Fixed snow displacements poking through the roof
- Fixed bullet holes poking through soft snow
- Fixed snowman bombs not respawning properly
- Minor clipping improvements
- Removed the Observer[/quote]

Rumor has it:

- Size is ~70 MB