Microsoft just announced a new game for the 360: Codename: Kingdoms is in development from Crytek. The game features all live actors, and seems to have a mythological setting of some sort.
Official details were not really revealed, but the rumor is Crytek has been working on an online FPS... perhaps even a MMOFPS. Could this be Codename: Kingdoms? Time will tell! And we'll fill you in on details of this game as they become available.