this is totally possible. apparently bungie said no more halo. and i also heard there making a new marathon. if u add 1+1 it should = master chief going back 2 marathon, witch according 2 my dad is where master chief is from. idk the details but if u play the original marathon he's there. then he went to the halo universe. my dad has followed marathon and halo 4 quite some time, so its fairly reliable. the only thing is, if u follow the novels, hes a member of the spartan project in the halo universe. then hes also from the marathon universe. it makes sense that he'd go to marathon. because it dose look like mars. it ALSO looks forerunner in design at least 2 me.