After seeing the final 10 seconds you get by completing the game on legendary, what are the implications? I know the planet he is heading towards is Onyx, his homeworld. Doesn't that leave it open for Halo 4? I know Bungie are not planning to make any more games in the Halo series though. Just when they finally cleared up all the loose ends in the plot, they open up a new storyline in the last 10 seconds!