User blog comment:Damac1214/Call of Duty: Advanced Warfare Reveal Trailer has Dropped/@comment-2092722-20140502115520/@comment-1187559-20140502135814

343 took over from Bungie because Microsoft wanted to keep the brand going. Sledgehammer is not under the same constraints. Aside from being "Call of Duty" they don't have to continue the Modern Warfare series. And the fact they helped work on one Modern Warfare game doesn't automatically mean any product they make has to be related to that.