An Insult to true fans of the Alien franchise

I work for a company that does test screenings of films, so I know a little bit about the decision making process that occurs for filmmakers in the post production process (no - I haven't seen this film, nor do I know anybody who has). What I do know is that film companies often purposefully deceive the public at large in order to hide a film's true plot. That would be great if this ended up being true for Prometheus. However, in this case, I believe that many of you folks online have this movie pretty much figured out - sadly, it's not going to be a prequel or even an origins film for that matter. This film is truly going to be an original stand alone feature, much like if Robert Zemeckis decided to do a Back to the Future prequel revolving around Marty McFly's neighbors. Of course, a film set in Hill Valley without a time traveling DeLorean would be a true disappointment and an insult to fans. And that's exactly what I think Prometheus will end up being. I think the general fan base wants to see an actual "Alien" prequel; at least something showing the origin of the Xenomorph. I think Ridley Scott is doing a real disservice to his fans by producing a film that essentially has nothing to do with its predecessors. I mean, what folks really want to see is the "alien". I think the Prometheus filmmakers were worried that if they did a true Alien prequel that it would bomb just like with the AVP franchise. Also, I think Scott didn't want to do the same thing twice, or in essence, monopolize on something that everybody has already seen. That's smart, but not necessarily wise in an era of sequels, prequels, remakes, and reboots. I think he may have missed a good opportunity to explore a great origins piece. Instead, I don't know what we're going to get, but from what I've heard and read online, this movie is going to be a far cry from what we truly want it to be. That's my word, what's yours? -Thomas