I feel this thread is going way off topic. What does the xenomorphs survival strategies have to do with AVP3?
Anyway, for AVP3 I'd want it to be part ship, part foreign planet. Maybe 1/4 ship 3/4s planet. And make it much, much longer than the other two. Good story needs to be reigned down upon the franchise. In timeline, I'm unsure but would prefer something pre-aliens. Something post alien I think could do well. We're already gone through in the first two AVPs that they have no f**king idea what they are dealing with. With at least SOME knowledge we could get marines, or some sort of f**king guns in the mix. A longer story could also mean more battles, but more plot and character development.
And we definitely need a great chestburster scene. It needs to be graphic, but befitting of the mood. A supporting character getting bursted halfway into the movie would be a great touch. Aliens need to be tougher and more 'sneaky' but I disagree into not making more than a few die. Predators in mass would be harder on the plot in my opinion, because unless they're together constantly you have to follow the actions of more than one or they become fodder. Make em' tougher, more predator battle damage, and longer fight scenes that involve more than just plasma cannon blasting. Set the MOOD. We need the grime, the black and scary, the silent and invisible. Bring back the tension. We're going to see predators and aliens duking it out, why not give it a little creepiness factor. We need to see the worth of both the alien and predator as an individual.
In two of the alien movies we see just one, but that single alien brings hell with them. We need to set up that predator is fighting the deadliest species in the galaxy. Predator is tough as nails, but seeing a predator actually 'hunt' would be a great pleasure. The AVP movies just trash the whole predator concept of silent killer. AVPR did a better job with this (Sewer Scene) but then ruins it with him just roaring 'come and get it'. Sweet traps, interesting deaths, and make him work for that alien kill.
Yes, make the alien more deadly, but don't make it too much of a power house. We need some alien deaths, but have some grids and dragons to give the predator(s) a run for their money. Not too much personality, but enough to pump you up when the predator and 'boss' aliens mess each other up. Work in more specific deadly aliens, rather than queens and predaliens. This will spotlight them more, and play against the cliche endings we expect.
I guess this is more of what I want to see, rather than specific plot, but with all this in mind, even a simple plot could be golden.