Empire recently had the chance to chat with filmmaker Ridley Scott, who's gearing up to make his new Alien Prequel film, and he shed some light on when the story might be taking place.
"It's a brand new box of tricks," said Sir Ridley. "We know what the road map is, and the screenplay is now being put on paper. The prequel will be a while ago. It's very difficult to put a year on Alien, but [for example] if Alien was towards the end of this century, then the prequel story will take place thirty years prior."
Scott will direct from a script by Jon Spaihts, but it's unclear when production would commence.Source: Movieweb.com