Aliens:
-AlienĀ³
-Alien Resurrection
We decided against reprinting the movie adaptations for a variety of reasons. Since the movies are widely available, the comics adaptations are kind of redundant and a poor substitute for the films.
-Countdown
-Crusade
The stories that were printed in the UK Aliens books either have no existing files or artwork available to us (Countdown) and/or the stories weren't completed (Crusade). We decided to not include those for those reasons.
-Newt's Tale
There is an issue of likeness rights that precluded us from reprinting this. Someday, maybe.
(-Tribe)
Since this isn't comics, we decided to not include this in the Omnibus collections.
Predator:
-Predator 2
Again, we decided not to reprint the movie adaptations.
So that's that folks.