Via [url=https://list.valvesoftware.com/]HLDS[/url]:

[quote=Valve]- Fixed broken path for community_maps_5 in the ConTracker
- Renamed Team Blackout war paint to Blackout
- Fixed the names of the Delightful Doves, Ravenous Ravens, and Vicious Vampires Unusual effects
- Updated Toxic's second objective to be 'Collect a Halloween Pumpkin on Toxic'
- Updated the School Nuisance to update the backpack icon and fix some clipping issues on the LODs
- Updated the Sear Seer to fix a paintability problem with the 'Dusk - No Lenses' style
- Updated the Heavy Rain Unusual taunt effect to improve visual quality of the effect in dark environments
- Updated cp_darkmarsh to reduce fog intensity

- Updated zi_atoll, zi_blazehattan, zi_devastation_final1, zi_murky, zi_sanitarium, and zi_woods
- Fixed missing overlay material for Sniper's Spit ability
- Fixed missing particle effects for Pyro's Dragon's Breath ability
- Fixed a bug that would cause players to get stuck in spectate mode when attempting to join a game in progress[/quote]

Rumor has it:

- Size is ~100 MB