Re: Prometheus: Ridley Scott returns to Sci-Fi
They are probably only denying that it's a prequel, so that people don't go to the film expecting the classic Xenomorphs/Aliens to appear.
That's my take on it too. If Scott were trying to completely reboot things, I suspect he would make things more different. (Didn't the "Weyland-Yutani" name & logo originate with Cameron's Aliens
Kegg: "You're a Trekkie. The capacity to quibble over the minutiae of space opera films is your birthright."