Even out of costume, the xenomorph is f**king terrifying.
A special feature on the UK Steelbook edition of Prometheus reveals that Weyland's mentor was Eldon Tyrell, creator of the replicants in Blade Runner. It makes about as much sense as anything else in Prometheus.
The Prometheus Honest Trailer cuts to the quick, and is absolutely, positively full of spoilers.
Prometheus: Yep. A trailer for a trailer. Xzibit would be proud.