Sledgehammer Making Next Call Of Duty Game?

A job advert posted by Activision suggests the firm has ditched Treyarch and Infinity Ward in favour of Sledgehammer for the next Call of Duty game.
The advert, posted on Gamasutra, says it is searching for a new Community Manager to ‘drive the effort for Sledgehammer and the next Call of Duty game’.
Although it’s far from official, the ad suggests that Sledgehammer are working on the next full-blown COD release, though that could either be Modern Warfare 3 or Space Warfare.