Updates to Call of Duty: Black Ops - Multiplayer have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
Call of Duty: Black Ops - Multiplayer
Backward compatibility for films created before Patch 1.05
Issues with weapon purchases after prestiging in some cases
Leaving a server and joining a different server, could briefly show the Map of the previous server
Duplicate player name on a server now becomes playername+slotnumber instead of ‘Unknown Soldier’
During a 'Demolition' match, the 'Auto-balancing teams' options may cause a 'Defender' player to respawn with a 'Bomb' icon in his inventory
Minor Shader Warming speed increase
One In The Chamber no longer counts democlient as a live player
16x AA menu option for compatible graphics cards
Additional Stability improvements
http://store.steampowered.com/news/4975/
Lo que no se es si ya ha updateado o cuando.
http://forums.steampowered.com/forums/showthread.php?t=1749991