Activision has confirmed the newest instalment in the Call of Duty series will feature an online co-op mode for up to four players.
That goes for the Xbox 360, PS3 or PC versions, which will also offer two-player split-screen co-op. The Wii game will have its own "unique" two-player co-op mode.
According to the press release, the co-op campaign "allows players to rank up and unlock perks in competitive multiplayer by completing challenges and earning experience points".

Full story: n4g.com