Okay, let’s take this one step at a time. First off, there’s an official logline out for Ridley Scott’s Prometheus, which may or may not be a prequel to Alien, but is definitely in some way related to it. The logline doesn’t really clear things up on that count, but it delivers the first concrete story details we’ve heard about. Read it here:
Visionary filmmaker Ridley Scott returns to the genre he helped define, creating an original science fiction epic set in the most dangerous corners of the universe. The film takes a team of scientists and explorers on a thrilling journey that will test their physical and mental limits and strand them on a distant world, where they will discover the answers to our most profound questions and to life’s ultimate mystery.
Nothing specific that ties Prometheus to Scott’s seminal work beyond the genre connection. The thing is, that logline came out after an anonymous source allegedly leaked a more specific layout of the plot to io9. I’m not going to reprint those details here, but there are explicit references to Alien narrative elements like “space jockeys” and the Weyland Corp. You can read it yourself at the source link, but know that Fox has stated publicly that the purported leak is not accurate.
Finally, Pandorum star Ben Foster has been confirmed for a part in the film, according to JoBlo. The actor joins what is already a pretty packed cast that includes Idris Elba, Michael Fassbender, Logan Marshall-Green, Noomi Rapace and Charlize Theron.