It seems as if Treyarch are looking for new personnel to work on a new version of Call of Duty. According to a job ad noticed by Gamespot, Treyarch are "bringing our hugely successful game to a new console."
Now this can be interpreted in several ways. A new console could refer to Wii U or even Playstation Vita, but it could also be a sign that Activision are preparing a Call of Duty title to launch with the next generation versions of Playstation and Xbox - the latter which is now expected to premier at E3 2012.