A new video has been found, with at walkthrough of Black ops. The video will show you a lot of new maps, like Nuketown, who is the smallest map in Black ops, and it takes places in a little plastic city, that would get nuked by the end of the game.
The video will also show you gameplay of the Wager Matches, and a lot of new stuff.

Link -> http://blackops.digitalwarfare247.com/news/gamespot-mp-walkthrough