...Neill Blomkamp would basically do Aliens 2.0
He worked with Weaver recently... i wonder if her talks about "the story not being finished" and "there are good young directors out there" are related to them working together. Neill is a geek and would probably try to pitch something to Weaver at least.
I'm quite surprised Danny Boyle isnt on that list. He would do a good moody horror.
But the REALLY good director for alien 5 would be....
Kathryn Bigelow.
After Insterstellar i bet Nolan will try to get his hands on another franchise to direct and keep going as a commercial director. I really dont see him getting anywhere near the Alien franchise, though.