Welcome back daveberg, me and many members wont forget that this site wouldnt be what it is if it wasnt for you.
With that being said...
I'm aware of Prometheus, I didnt create an enty for it in the movies yet because of the scarce information about it, and I want to be sure it fits in Alien Universe.
I think that now remains little doubt about it.
I have 100% trust in Ridley Scotts ability to make an awsome movie. He made two of my all time favourite movies Blade Runner and ofc Alien.
And now from the master himself:
A more detailed info from IMDB:
http://www.imdb.com/title/tt1446714/faq#.2.1.2
And now a personal confession, sometimes I wish the only existing movies would be Alien, Aliens, Alien 3 and Predator 1 and 2 and I could just delete from this site all the junk that was produced aftewards.