I found this script that is allegedly the opening scene of what would be Alien 5. Not sure how genuine it is, but it's an interesting read.

The most notable thing from the opening scene is the absence of Sigourny Weaver, and after reading the opening I'm not sure how they would work her into the plot. But perhaps that's the point? I'm not sure they need to make an Alien 5, it may be time for the producers to quit while they are still in credit. Bring on Predator 3 I say!

If this script is legit it makes for an interesting opening to the film, but I guess there is no way of knowing if this is real or not until any official news is released. In the mean time I guess I'll wait for Alien vs Predator 2, which is said to star "Michelle" (Tony's wife) from 24, to come out later this year.