The rumor doesn't state which studio would be working on the Dead Rising followup, although it does suggest that the developer is based in Los Angeles -- ruling out our guess of Texas-based Gearbox Studios, who only recently announced a "really big" project in pre-production.
Of course, they wouldn't call it a rumor if it were necessarily true. We'd like to see Capcom remain involved with the Dead Rising franchise, but if it does in fact pass on to a western studio we can only hope it falls into the right hands.
