Required updates for Team Fortress 2 and it's dedicated servers have finally been released. Please run hldsupdatetool to receive these updates. The specific changes include:

Source Engine:
- Refactored how lightmaps are downloaded to the graphics card at level load. On some hardware configurations this can lower level load times significantly
- Optimized some particle systems to improve performance on some hardware configurations
- Player stats are now sent up as they change, rather than when the player dies
- Improved playback of sub-frame sounds
- Fixed a crash caused by alt-tabs during map load
- Eliminated unnecessary temporary memory allocation in scenefilecache

Team Fortress 2:
- Badlands released
- Changes to Dustbowl
- Added a new access point to the stage2 attacker gates (drop-down left from spawn), allowing attackers a way to reach the left route without being subjected to the spam and sentry gun fire
- Fixed a gap in stage 3, cap 1 that allowed a player with to wiggle above the "ceiling" clip
- Fixed a gap behind stage 1, cap 1 house
- Fixed a high perch on stage1 cap1 house roof
- Fixed a perch offering view of nodraw textures and the skybox
(stage1 cap2 rock barrier)
- Fixed a few places where rockets/demoman pipes could pass through non-solid models
- Sealed up a gap over stage1 lower startgate
- Clipped off tall windows in stage 3 to prevent sentry guns from behind built behind them
- Changes to Capture the Flag Well
- Fixed trains not starting on map spawn
- Removed cap association from red spawns that were spamming console
- Changes to Granary
- Removed spawn timing advantage from the middle (from
-3 to 0)
- Fixed several model perch exploits (red, blue cp1 gate and blue cp2 gate pipe)
- Fixed a few places where players could get stuck between containers and silos
- Adjusted playerclips on red container that made it appear like players were floating
- Added a small delay (200 ms) before a zoomed sniper shot can get a critical hit
- Added server side convar mp_fadetoblack. Same functionality as Counter-Strike, used mainly during in-person tournaments and LAN events
- Added flamethrower "sizzle" sound when the Pyro is hitting a target
- Updated explosion debris to be a bit darker
- Fixed idle players not being kicked from the server if mp_allowspectators was set to 0
- Added ctf_well to the default mapcycle.txt file
- Added ctf_well to the default motd.txt file
- Fixed floor tile material type
- Fixed some weapon damage info missing from TF2 game stats
- Made some small changes to the Demoman viewmodel that were causing performance problems
- Added a new timer to the HUD to show the value of mp_timelimit. This is useful if you're playing a timed match on 2Fort, where you only set a timelimit on the server and no other win conditions.
- Added server log entry for buildings destroyed by their owner
- Fixed sentry gun shadows being clipped
- Updated glass material

SourceTV:
- SourceTV now uses a hidden slot on the game server. This allows for 24 player servers to also have a SourceTV proxy connected to it
- Fixed Pyro's flamethrower flames not showing up in SourceTV