Mark Lamia, the head of Treyarch studios, confirms that the new adrenaline filled first person shooter, Call Of Duty: Black Ops, will include multiple co-op modes, which will be seperate from the main, single-player story. Treyarch also say that the multiplayer for the game has been the studio's primary focus - presumably because this is the most popular of its game modes, as anyone who has a younger brother obsessed with online games knows...
One mode will be a two to four player co-op story, which is said to contain, according to Lamia, "at least two main characters in multiple covert international conflicts over quite a long period of time during the Cold War." What the other co-op modes will entail, we don't know yet.
Call Of Duty: Black Ops is set in the Cold War, with levels set in places ranging from Russia's Ural Mountains to Vietnam. Putting you in the ruggedly manly boots of a soldier with the Black Ops - a secret, covert service, who's operations normally exist outside standard millitary protocols (and are therefore frowned upon in conventional war) - you'll be working behind enemy lines, on top-secret missions.