Via [url=https://store.steampowered.com/oldnews/154639]the Steam store[/url]:

[quote=Valve]- Fixed missing nomip/nolod for Sniper's zombie image in the main menu
- Fixed the match status HUD not being hidden during freezecam screenshots
- Fixed the Safety Stripes hiding the Soldier's hat
- Fixed tournament medals moving around while using the Taunt: Deep Fried Desire
- Fixed a problem on ctf_crasher related to infinite giants
- Updated pl_sludgepit_event
- Fixed skeletons/ghosts being able to spawn again if the cart backs up over a checkpoint
- Added an extra resupply locker in BLU's first spawn
- Added a few more Mann brothers voice lines and fixed the map description
- Added Soul Gargoyle pickups
- Replaced a few skeleton spawns and reduced amount of skeletons that spawn on each cap
- Made the map a bit spookier
- Updated plr_hacksaw_event
- Changed the roofing near the finale, preventing players from walking from one barn balcony to the other
- Replaced barn balcony windows with widened doorways to streamline movement
- Fixed the VO in the underworld playing multiple times
- Fixed floating candles when the graves were destroyed
- Updated the HHH to use the new "SetModel" input
- Delayed final capture VO so they're more audible
- Adjusted prop fades
- Adjusted detailing
- Updated cp_spookeyridge
- Added significant health and ammo packs to underworld
- Reduced damage dealt over time in underworld
- Updated portal particles to stand out more in overworld (Thanks FissionMetroid!)
- Added small healthpack to upper drop down area next to last
- Adjusted ammo pack sizes around map
- Slightly tweaked pumpkin bomb and coffin placement
- Fixed a few areas you could get stuck in
- Expanded area around coffins that won't allow teleporters
- Fixed some minor clipping/collision issues
- Adjusted some prop fades[/quote]

Rumor has it:

- Size is close to 60 MB