Henriksen's denial of this "news" confirms what I suspected and thank heavens because I hate this idea. Bishop was an android in the film Aliens, that's all he was ever meant to be.
The concept of having him return in not only Alien3, AVP (*shudder*) and the Alien Prequel reeks of Star Wars Prequel syndrome... All the characters in the Alien movies are connected in some way... blah, blah, blah. The last thing any fan wants from the prequel is 'The Phantom Xenomorph'.
Of course, if there was a VERY good reason for Henriksen to the in the prequel, then that's fine but let's face it; there is no reason for this to happen in a credible way.