With Modern Warfare 2 sales exploding around the world and breaking records in various countries, I guess it doesn't come as much of a surprise that there's already talk of a new spin-off title based off the character "Ghost" in the game. He's the guy with the skull mask, just like in Army of Two.
Voice actor Craig Fairbass let slip that Ghost will be getting his own comic book and possibly another game to go with it. Considering the popularity of the series, it's surprising it hadn't been exploited more until this point. But it's happening now, so prepare to see a whole lot of Call of Duty spin-offs in the future, especially if this one becomes a success. Looks like Grand Theft Auto is no longer the king on the block.
"I did in the last game a voice for a character called Gaz and in this game I’m now voicing a guy called Ghost, who now just got a spin-off comic of his own and they’re talking about another little game to go with it, so, I’m quite excited about it. It’s grown and grown and grown."