Sigourney Weaver recently commented on Ridley Scott's 'Prometheus' today with HollywoodOutbreak. She mentions briefly how Ridley Scott is going with the ideas she purposed to him. Investigate the Space Jockey and explain how the Alien eggs arrived on the Jockey ship in the first place...
Sigourney:
"I actually talked to Ridley about this very idea, and I’m delighted he’s doing it. I feel it’s in good hands. It’s a wonderful franchise and if they can invigorate the creature, it could have another life,"
"When you find [the alien] in the first movie with what we call the Space Jockey, the kind of strange creature with the elephant face… anyway, the eggs were in its ship, so where do they come from? So it’s like kind of following that storyline with, I hope, another great ensemble." - HollywoodOutbreak
http://www.prometheus-movie.com/