Via [url=https://store.steampowered.com/oldnews/89183]the Steam store[/url]:

[quote=Valve][b]Scream Fortress XIII has arrived![/b]
- Featuring 6 new community maps: Farmageddon, Sinthetic, Los Muertos, Erebus, Terror, and Graveyard
- Added the Crimson Cache Case
- Contains 20 new community-created cosmetic items that make up the Crimson Cache Collection
- Has a chance to give one of 5 new community-created Halloween-restricted items as a bonus item
- Has a chance to give a taunt Unusualifier as a bonus item
- Added 28 new community-created Unusual effects
- 15 new effects for Unusual hats
- 13 new effects for Unusual taunts
- Added the Scream Fortress XIII War Paint Case
- Contains 13 new community-created War Paints that make-up the Scream Fortress XIII War Paint Collection
- Has a chance to give a taunt Unusualifier as a bonus item
- All players who launch the game will receive a Soul Gargoyle if they don't already have one
- Grants access to Merasmissions and Halloween item transmutations
- Tracks Merasmissions completed and souls collected
- All Halloween Contracts have been reset, allowing them to be completed again
- Added new Contracts for this year's featured community maps
- Completing a Halloween Contract will give players a classic Halloween item and the chance for a Crimson Cache Case or Scream Fortress XIII War Paint Case
- Continue last year's event by collecting the souls of dead players for your Soul Gargoyle by killing enemies, doing map objectives, or collecting the Soul Gargoyles that spawn in the maps
- All cosmetic and taunt Cases will grant Halloween 2021 Unusual effects instead of their normal Unusual effects during the event. This does not include Crates.
- Join Halloween matches by using the Special Events category in Casual
- Scream Fortress XIII runs through November 7th, 2021

[b]General[/b]
- Fixed being able to remove name/description tags from a couple of the stock items
- Added ConVar "tf_delete_temp_files" to control custom player sprays and other temp files being deleted on shutdown
- Can be toggled in the Advanced Options dialog
- Default is to delete the temp files
- Updated Bat Outta Hell to fix an issue with the materials
- Updated koth_slasher
- Reduced round timer to 6 minutes
- Removed truces from Merasmus and Monoculus events
- Fixed an exploit where players could get behind the Otherworld's cabin and attack unsuspecting players
- Fixed a series of hairline perches in the yards
- Fixed a pair of visible nodraw entities outside of the spawns
- Fixed an exploit where players using the Minify spell could hide in the caves
- Added a strange rustling over there in the woods... ?
- Updated/Added some tournament medals
- Updated the localization files[/quote]

Rumor has it:

- [b]Size is close to 575 MB - data capped users should be prepared to take action[/b]