It's perhaps a matter of various statements during different stages of principal photography, but I am slightly confused.
I remember Ridley saying that they shot first 14-15 minutes of movie, so called "The Beginning of time" sequence like 2001, on Iceland. They apparently shot some LV-223 exteriors there as well (there were some photos of the props from the set, right?) and in Q&A video above, he also says there is 5 to 6 minutes of David walking through the ship, busy with some android/butler business.
Therefore, Prometheus won't be classic three act movie? I mean, Overture: "The Beginning of Time", "The Prometheus", "The Temple", "Stealing the Fire", "The Punishment from the God(s)", "Coda (Alien DNA)", credits, David disco medley from the two years on Prometheus?
And second thing.. It seems to me that nobody from the interviewers/press didn't make any review of so far answered things and they keep asking about the same stuff & stuff they obviously can't speak about in order to keep the secrecy until the release.. "Fortunately", Ridley doesn't hesitate to f-bomb anybody