Via [url=https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds]HLDS[/url]:

[quote=Valve]- Added the 'Tomb Raider' tag to the item import tool
- http://www.teamfortress.com/post.php?id=14855
- Added The Kritz or Treat Canteen to the Halloween 2014 Community Bundle
- Players who previously purchased the bundle have automatically been granted the item
- Fixed a client crash that could happen while the server was changing maps
- Fixed the Teleport spell not appearing in Helltower
- Fixed rare spells appearing in regular Helltower spellbook pick-ups
- Fixed disguised Spies not displaying the correct health value to enemies
- Fixed the Engineer not playing the proper response rules while using the Golden Frying Pan
- Fixed the Sniper getting stuck with a zoomed FOV after taunting while zooming
- Fixed maps not loading correctly in the SFM tool
- Fixed a bug in the Workshop import tool related to frame count calculation for taunts that were exported from the SFM tool
- Fixed the Demoman not riding in the correct bumper car position when holding two-handed melee weapons
- Disabled auto team-balance while players are in hell on Helltower and Carnival of Carnage
- Updated bumper cars to deal damage when hitting players not in bumper cars
- Updated the Necro Smasher so Strange parts and Halloween Spells can be applied to it
- Updated the equip_region for the Iron Fist
- Removed the smoke effect from the Tiny Texan
- Updated the Rescue Ranger so players no longer block its ability to pick-up buildings from a distance
- Updated sd_doomsday_event
- Fixed a bug where Merasmus's curses would trigger during the bumper car minigames
- Fixed players using the tiny-melee-only curse to get outside of the playable area of the map
- Fixed a bug with the Eureka Effect and with teleporters where players could escape being teleported to the bumper car minigames
- Reduced duration of the Monoculus spell from 15 seconds to 8 seconds
- Fixed players being able to construct buildings in the spawn areas
- Fixed Engineers not being able to build if a Merasmus curse is enabled while they were carrying a building
- Updated Merasmus's curses to remove all projectiles and sentry gun ammo when teleporting players to the middle of the map[/quote]

Rumor has it:

- New main menu screens were added, Steel & Iron of Facepunch showcases all of them without menu elements (requires creating an account or logging in, GG Garry Newman): http://facepunch.com/showthread.php?t=1398764&p=46410955&viewfull=1#post46410955
- Item schema update: [url]https://github.com/SteamDatabase/SteamTracking/commit/b0203131adadded6b75d448b1fe8521ad9796841[/url]
- This just adds a "Robot Pyro Collectible Figure Promo" item
- SPOILER ALERT: [spoiler]No Binding of Isaac promos[/spoiler]
- Size is ~50 MB