The whole franchise, including Predator, is an eloborate marketing campaign by Pizza Hut!
It was them who created the Xenomorphs.
The final scene, and twist, will involve a Predator walking into a Pizza hut restaurant and joining an Alien to share a pizza.
What would you guys think then? Would you guys be happy, as long as the Pred was a "real" Pred and the Alien was not a space ant?