Sigourney Weaver recently spoke abut the project, saying it's still an active project. She also gave a few more details, saying, "It's just as if, you know, the path forks and one direction goes off to three and four and another direction goes off to Neill's (Blomkamp) movie".
James Cameron spoke about the anniversary, saying, "I don't normally pursue these kind of nostalgia moments like we're going to do down at Comic-Con, and I didn't do it much at all for Terminator on its 30th, but there's something about Aliens. It was a milestone for myself and Gale because the film got seven Academy Award nominations."
Along with Alien 5, there are at least two more Alien prequel planned.