According to MediasharX, Ridley Scott apparently had an interview with a Japanese DVD magazine called Famitsu Wave and spoke about Alien 5 and Predator 3. Here’s the main bits of the interview:
FW: And the rumor of another Alien movie?
RS : We have been talking about doing another one for years. It’s been a complex situation. At the end of the day, a studio has to be pleased, a core audience has to be pleased, and a director has to agree to all that. I am glad to say things are progressing…
FW : With you as Director?
RS: I don’t think I’ll be directing, but I will have some involvement. It’ll probably be based on an idea I have, so I hope I’m asked to be involved… In broad terms, It’s something for those folks that want to see Ripley’s Journey come full circle and..
FW : Do you know when this will happen?
RS : Fox are waiting to see how Aliens vs Predator does, and then they’ll do the Alien movie, and I believe a Predator film too. Again, if I’m involved in it, great, if not, then that’s luck of the draw.aw.