Tonight's MP reveal was apparently a huge hit with everyone in attendance.
Steamworks integration
Steam will be the PC version's DRM
VAC is the anti-cheat
Server browser for PC users
However, all servers must be rented through gameservers.com if you want a dedicated server.
50 player ranks, prestige is also in
No word on any beta for any platform
They were also not talking about anything Zombie mode related
Console users will use the old matchmaking system from the previous titles
Huge amounts of customization:
-Custom emblems
-Tags on weapons, etc
Mod tools are said to be in the works, but will not be available at launch
Theater mode that is slated to rival that seen in Halo 3 (record demos, view in third person if you want, all sorts of video editing features built in)
Unranked matches are near fully customizable
Killstreaks are a bit more involved for many items beyond merely pressing a button to launch something and forget about it
New game modes, centered around the new Wager Mode gametype:
Unlocks aren't done through leveling up, but rather through the acquisition and spending of Call of Duty Points, a sort of in-game currency. Play, earn points, spend them on the equipment you want instead of hitting a level milestone all the time.
New trailer released tonight for the various Wager Matches:
YouTube - Call of Duty: Black Ops - Wager Match Trailer
Everyone there has been super impressed with what they saw.