I really don't want Halo 4 from 343i. I'd gladly wait for Bungie's 10 year tenure with Activision to finish before we see Halo 4 for the 3rd Xbox. I want 343i to deliver something completely different with new characters and a new type of game.
I'm hoping there's a sequel to Halo Wars in the works with Kinect control, maybe from Robot Entertainment.
But if I were to have 1 wish; I'd like to see a squad-based shooter that follows on after the ending of the novel The Ghosts of Onyx.