@SM: If you're going to use that logic, you need say five and include Prometheus. The thing is, I don't agree with you. This project revolves around Alien, first and foremost. The acknowledgement of anything that occurs after Alien is not a requirement of the developers. God is not going to smite them down if they ignore Aliens, Alien 3, Alien: Resurrection, Prometheus, or the AvP films. There's also the novelizations and spin-off games. CA doesn't have to acknowledge those if they don't want to, so what cosmic force is binding them to kneel to Cameron's ideas concerning the beast? None. They can do what they want, and in this case, they can use Amanda and not have to pay homage to Aliens if they don't want to. One of the joys of being a developer is you can do what you want, kind of what like Cameron did when he made Aliens.
Now, you could make the argument that FOX is going to force CA not to discredit Aliens, but so far I haven't heard you say that...