I think that Ridley Scott wanted back into the Sci-Fi Genre. So he basically took the original movie with a much larger budget and an Original and semi-revised script of the original Alien Movie and Just remade his original masterpiece.
First he said he's basically sick of the Zenomorph's, Prometheus is an Original movie with hints of Alien DNA, The Movie has Space Jockeys "Engineers", The Weyland Corperation, Gieger's Designs, and Alot of the first act from the original Obannon Script.
That being said , I still think this movie will kick ass but I just think it's a Re-Imagining of the original or maybe what he intended to do all along with Retrospect , bigger budget and tech of today he didnt have back in 1979
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