A job listing for Treyarch states that the company is looking for a new senior software engineer for a team that is "bringing our hugely successful game to a new console". It's not blankly stated, but that game has to be Call of Duty, and it wouldn't be too much of a shock for that "new console" to be the Wii U. Of course, it could also be the Xbox 720, but that feels like it'll be a bit further off.