I just hope it doesn't literally tie in with Alien. What I mean is, the derelict seemed to be on LV 426 for thousands of years, its pilot fossilised (No, I still don't accept the Space Jockey as a suit).
I don't want to see the derelict crash land on the planetoid just a couple of years before the events of Alien, except maybe if it was already a derelict in space and it crashed in that state.
I would like to see:
1. The Space Jockeys as the ones who created the engineers and the engineers as the ones who stole "the fire" from them;
2. The Aliens as life form (made by the Jockeys or not), that the engineers are trying to replicate but never can;
3. The derelict as the last place where pure living Alien samples exist (maybe, haven't thought this one through).
I know, dream on...