We have a prequel, it's called Aliens vs. Predators.
Takes place years before the original.
That's as prequelish as it gets.
and while we're at it, why not have the twenty exosuits vs. teh twenty queens.
Be better then the crap the've given us so far.
But I digress, I'm with Keith, Ripley's like a half Alien queen now right? We should see her start punching teh Aliens through the skulls.