Blix Reaper

The MC and the unsc forces find out that the forerunner AIs have gone crazy and are bent on destroying the universe starting with activating some giant forerunner last resort weapon. It would be a cool storyline

I think that after the demo showed at e3 the forerunner AIs out number masterchief and the spartan 4s assist him and save his life. The spartan 4s are like holy **** its master chief the guy who saved earth and head to the infinity. Thats my prediction.