Awesome... Just a 1 minute trailer has me even more hyped to see this film. And given with what we have seen in this trailer, I think it's safe to say it should be considered and Alien Prequel. Even if no conventional Xeno's show up, the presence of the Derelict cements it for me.
Really, I think the biggest question I want answered is: Do the original Giger Xeno's (egg, facehugger, adult) appear in this movie? Or something new?