Dammit, you're god-modding the damn predator again. They seriously need to find a way to appologise to the Aliens in the third movie, perhaps instead of one Pred kicking Alien ass, one Alien killing off members of a Pred ship. (JK)
Anyway, I was kinda hoping for a world-wide breakout, like they do it the way they did it in Revenge of The Fallen, they cover up the incident, and then, like you said, they thaw out the Alien mother in the ice, and bring her to some remote complex where they begin researching the creatures or something, and then, say, the pred ship lands and causes the aliens to break out. Soon, they're all over the damn place, hives everywhere, pred ships everywhere, they find there are predator doomsday weapons hidden inside of ancient ruins all over the world, and maybe onboard the pred mothership there is some mechanism for activating these weapons incase a planet-wide infestation were to occur, and the humans have to somehow find a way to shut it down before the timer hits '0'. And I am not sure if I would prefer one on one avp action, sure it is AVP but that shit gets old. I think it should just be like background story, inbetween major plot points have preds and aliens, like legions of preds fighting swarms of aliens, fighting each other all around the world, like egypt, paris, russia, etc, and most of the plot would surround the humans trying to find the 'off' button. In otherwords, try to make something different other than constant alien on pred action, it gets old.