I loved the trailers, both of them. However, it seems as if the biggest part of the movie has been told in the trailer. Why they are going out there, something there wants to go to Earth for a bad thing, we see what looks like the Derelict and the Pilot, we see Prometheus crashing into it as if it wants to prevent it from reaching Earth. It gives the distinct impression that this ship is indeed the Derelict from Alien, and this planet is LV426, that this ship carries Eggs.