I a way, I think it might go the direction that many on here have been calling for. It's a big universe, the Xenos are one small part of it. All this stuff could take place in the same 'verse (like Blade Runner and Soldier for instance), but not really have any connection at all apart from a shared history (Weyland exists in the universe, there is a ship called the Nostromo, there is the ICC and all that).