I'm trying to figure how they can include 3+4 while still carrying on from Aliens and I wonder if Blomkamp's story could fall somewhere along this path; Ripley is part of the grand experiment, a resourceful, instinctive, indefatigable fighter - the very best qualities of humankind. Rescued from the Sulaco, she's has been in stasis for years, but she's also been cloned and sent out to face different "exercises" against the Xenomorphs in a bid to understand their behaviour. Alien 3 and 4 are examples of these "exercises" - in some of these other universes, she's also failed - and perhaps we have a glimpse into these. The original Ripley is awakened, discovers the company's ultimate goal, to have the alien deployed as the ultimate weapon and now so trained in tackling Earth's most determined warrior, they are virtually unbeatable. Anyway, you get the gist - any other theories?