my idea
set in the future obviosly, and W.Y. is already aware of the aliens existance
the planet would be a jungle habbitat aswell as a large W.Y. complex
W.Y. is farming alien eggs from the remains of an predator pyramid they discovered on a distant planet, i dont like the whole pyramid idea but its already been established in the first film. A lone predator, who has been keeping eyes on the pyramid, is emped and captured by W.Y. after hunting humans trying to stop them from taking the eggs. W.Y. performs many experiments, using the face huggers on humans and eventually on the predator. The chest burster is sergically removed from the predator, like in ressurection, so the predator will servive. In quarentine, where the alien are kept their are already drones, and a couple praetorians, and the predalien. While performing tests on the predalien, W.Y. wants to use it as a weapon since it is much stronger than drones, it escapes slaughtering the team tesitng it and works its way to freeing the captive aliens. The preatorians lead as the drones follow slaughtering W.Y.s army and team. The predalien also finds a way to release face huggers, kept in quarentine, which increases the alien population. The aliens overrun the W.Y. complex trying to get back to the queen which is still alive under the surface of the pyramid. Three predators, which would have been alerted earlier in the film of the predator getting capture, arive on the planet. They move from the jungles, where they have already encountered a few drones to the W.Y. complex where they have to find and rescue the captive predator. The predators would die slowly in this film not all but one in one scene. One predator would die before they rescue the captive predator, one die in a huge fight with aliens as the rescue their friend, possibly by the predalien, it would take both the remaining predators to fight and kill the predalien, other drones would be with it. the last off the three predators would die, with the rescued predator being the last left. the captive predator decides he must stop the alien overrun, instead of surviving so he would go and kill the queen. He cant fight the queen and aliens but puts up a good fight but eventually self destructs, kills many but not all the aliens.
This is just rough thoughts of my dream film, im not sure how humans would come into play.
Either a group of survivors during the alien overrun or marines coming to either to rescue/or investigate the rumors of W.Y. experiments on humans.