Looks like it will be great. We'll finally get some answers on the "Space Jockeys."
All we've had so far was the brief scene in the first film. There has been some info filled in with the books. But as that's a separate storyline it doesn't count for the "canon."
One thing I want to know is what happened to whatever burst out of the pilot. That thing had to be around somewhere. It's a shame we won't be seeing any Xenomorph because it would be an explanation. Or maybe we'll get some indication that this is where the Queen came from and that it was in hibernation somewhere else in the ship until the planet was settled in between the first and second film. Which seems to imply "the company" knew what was going to happen even before they put people there. Like it was all a plan they came up with.
A scene from Aliens more or less confirms it when Ripley says she read the report Burke made about sending people out to the derelict ship.
Prometheus may retcon this to be true. If not we have the implications given from the Nostromo's computer and Ash the Android.