Humans are the aliens?

Not to beat a dead horse here- but I keep going back to the "Alien DNA" remark Scott keeps making. Maybe the facehugger is the star of the whole thing- but simply the delivery vehicle for making copies of whatever the SJs make up previously. It would blow all the other alien spin-offs up as far as canon, but Scott hates them anyway. It won't surprise me for him to do something that really takes away from all the movies that came after his. The facehugger has always been used as part of the zeno life cycle, but this appears to be going in a totally different direction. Damn the trailer! Now I'm gonna be speculating for the next 6 months!

I'm under the beleif that facehuggers are infant space jockeys and kill an elder engineer / jockey in order to grow to maturity. Accidently growing inside a human creates the xeno, but not until near the end of the film .......................... I think the rest of the film will be based on humans discovering and then trying to steal the secrets of the jockey's, who turn out to be quite nasty.....................