Halo 4

- Who runs the space ship-type thing that Master Chief and his ship is lifted up into? Is it hostile or are they allies? The fact that MC's ship is in flames and the characters MC and Cortana are in distress suggests that it has hostile intentions. But can we be sure? Is it a Forerunner structure?

- Why is Master Chief missing pieces for his uniform? At one point in the trailer it's clearly visible that he is missing his cod piece. Has he been in battle whilst up in space or is it just how he looked after his mash-ups from Halo 3?

- Condensation that has formed on the window of Master Chief's cryogenic unit might suggest he's been in orbit for a long time.

- The 'mysterious' world that MC's ship is orbiting. Is it something to do with the Forerunners?

- Microsoft state that: "Set in the aftermath of Halo 3, Master Chief returns to confront his own destiny and face an ancient evil that threatens the fate of the entire universe." Does 'ancient evil' give more evidence towards game being centered around the Forerunners?

- Halo 4 to be based on the story of the Forerunners. Perhaps we will learn more about how they became to be and the new story will center on Master Chief's journey to destroy them? Or even how to eventually co-exist alongside them...?

- Master Chief's missing parts such as the cod piece suggest some sort of problem arose whilst in space. Does it insinuate MC wasn't cryogenically asleep the whole time? Has he already been awake for some time to deal with the new problems? How long was he in 'sleep' for before 'problems' arose?