Sledgehammer Games working on Call of Duty game

When Glen Schofield and Michael Condrey left Visceral Games to form Sledgehammer Games with Activision, you may have jokingly speculated that the Dead Space creators set to work immediately on Call of Duty. After all, it was either that or Guitar Hero.

You would have been correct.

Activision today revealed that Sledgehammer is working on a Call of Duty game with a targeted 2011 release date, which will "extend the franchise into the action-adventure genre." No other details were released about the game, but it sounds more like a spinoff than a sequel. Third person, perhaps?