You know... after watching Alien: Resurrection, it seems that there's more than Weyland-Yutani who wants the Xenomorphs back alive. Because it was the military who was all over the place, like that general. Perhaps it's the military who tasked WY to get the damned things, but it hasn't been too successful, all thanks to one of their former contractors named Ellen... so in Alien 5, it can be made that some elements of the military will be the "company" who wants the Xenomorphs badly as weapons. And maybe there could be more clones other than Ripley's clone who are alive and able to fight Xenomorphs... or be one of the military "shadow group" who want them was weapons.
EDIT: Whoops, I forgot that this is a Bishop thread, so I'll just say... it's a tossup on whether to bring back Bishop or not...