Rumor on Xenomorph origins (and some other spoil-y bits) explained from someone claiming they saw a test screening:
Spoiler:
The tl;dr of the movie is that David creates the classic xenomorph by merging android "DNA" with the proto-xenomorph you see in the poster. This is what gives them their intelligence. We also find out a few new tricks that the xenos can do, which explains how they get around the ships so easily in the other films. Not going to spoil it, but the bio-mechanical appearance isn't just appearance any more. I think this one will divide Alien fans but I mostly liked it.A basic form of the xenomorph already exists in the movie and takes up the bulk of it. This isn't the deacon from Prometheus but basically a pre-classic-xenomorph which is more natural and animal than the one from the old movies. David uses the catalyst oil to transform it into a life form that's sort of between organic and synthetic. It's why Ash is so fascinated with it in the first Alien film and regards it as perfect.
Yeah, two different androids. There's a sort of cat-and-mouse game where David is constantly being watched by Walter, who doesn't trust David at all. Walter attempts to "upgrade" David, and there's a twist where you find out that David has overcome his programming and become sentient, so it doesn't work, and he ****s over Walter. Superb performances by Fassbender again."
