The trailer looks awesome, but it should be noted the FOX executive's comments are very disingenuous. Yes, it's true they won't cut any material to obtain a PG-13 rating. However, Scott originally requested a $250 million budget and an R-rating before filming. FOX said they couldn't give him that much money unless he made it more family-friendly, therefore he filmed Prometheus with two cuts in mind. Anybody who can read between the lines will deduce that Ridley Scott probably filmed the movie to meet PG-13 specifications rather than an R that would possibly be cut.
As I remember it, he wanted the 250 Mio budget for two prequel films (they were planning to shoot them back to back) and that number has been repeated ever since. I don't think an estimate for the new budget has been published.
Having said that I agree with you that Scott probably tried to shoot for PG-13 (and with some luck prepared an extended cut for DVD/Blu-Ray).