I'm still trying to wrap my head to how Rage War is accommodating for Alienkamp (I refuse to call it Alien 5 since officially, it's not being called that) because that would imply that a script has already been produced, and that Lebbon has looked at it or that Fox has looked at it and given him a list as to what to do and not to do in order not to give anything away. For this movie to be set in the Resurrection era, more or less would set it in conflict with the upcoming movie UNLESS... references to Resurrection were removed.
I'd be quite surprised if they did. Judging by the timeline included in the book, the info regarding the third and fourth films is quite ingrained into it. Be pretty hard to just lop it out without affecting the book. Plus, it's already been released as-is in some countries.
I would be surprised if they had added Alienkamp to this book as well, though I wouldn't hold my breath for that to happen. Working Alienkamp around Alien 3 and Resurrection, and keeping in mind of the things Blomkamp said is pretty hard to do.. well, not really since the whole Bobby Ewing route is an easy, easy but cheap cop out. But even if those were retconned to be dreams (I'd be pretty mad if they were and just not ignored-- not because I hate 3 and Resurrection, I love 3 but Resurrection is another story) then how would the source book keep dreams as "real" in-universe or even have a reason to keep them? Why would new EU material so much as even reference them aside from dreams them?
The only way I can see it being edited to fit the new film is if Blomkamp's movie somehow isn't a retcon and happens around the existing movies.
Personally, I hope the movie ignores Alien 3 and Resurrection and has no relation to them aside from the characters. I say this not because I hate Alien 3 and Resurrection, but it would cement what I've long since believed-- alternate timelines. Everything would have an assigned place. Call me selfish, but if it does what other franchises have done (you know which ones since I reference them), then I would be very happy and no one would be wrong in which path they follow.
Might be as simple as keeping the Aliens or the worlds or the company or whatever else in line with how they're going to be portrayed in the new film. Even if it's a different timeline, they probably don't want things straying too far off the path of what we're going to be seeing over the next few years.
That might be the likely scenario. Everything which Blomkamp is saying so far suggest that this is a different timeline. Or as Hicks refers to it.. an alternate sequel. Having that said, Nightmare, I think you are on the ball with that statement.
The only way I can see Alien 5 being put into new EU stuff, or Weyland-Yutani Report is if they print out a second edition which keeps Alien 3's concepts (not necessary the events of Fury-161) and outright ignore Alien Resurrection.