From IMDB:
Status = filming
Main crew:
Ridley Scott – Director / Producer, Damon Lindelof – Writer (screenplay), Jon Spaihts – Writer (screenplay), David Giler – Producer, Walter Hill – Producer, Tony Scott – Producer, Dariusz Wolski – Cinematographer, Arthur Max – Production Designer, Pietro Scalia – Editor
Cast:
Michael Fassbender
Idris Elba …
Charlize Theron …
Noomi Rapace …
Guy Pearce
Logan Marshall-Green …
Kate Dickie
Rafe Spall
Sean Harris
Benedict Wong
Prod company – Brandywine
Distributor – 20th century fox
Due for release 1/6/12
Trivia
Gemma Arterton, Carey Mulligan, Olivia Wilde, Anne Hathaway, Abbie Cornish and Natalie Portman were considered for the main role.
James Franco was considered for a role.
For the role of Vickers, Charlize Theron and Angelina Jolie were considered. Theron got the role.
Was originally intended as a prequel to Ridley Scott’s Alien, but Scott decided to turn it into an original film with Noomi Rapace (who was already set to star in the prequel) still in the cast as one of five main characters. Some time later however, it was confirmed that the movie will take place in the same universe as Alien (1977), it will greatly reference that movie, but it will, for the bigger part, be an original movie and not a direct prequel.
Michelle Yeoh was rumored at one point for a role in the movie.
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so, not a prequel. If you want more detail i can tell you they are filming it using the red camera, mainly in the UK and Halon Entertainment are doing the sfx