Just curious.
I doubt I’ll see the movie. Anyone know?
and furthermore, does anyone care? Isn’t the intrigue of Alien or Predator movies based on a situation where humans in an environment they can’t control must use their ingenuity to defeat a seemingly undefeatable scary opponent?
If Alien and Predator are merely eating each other, where’s the suspense?
Alas, there’s no easy answer 
You might say one on one, the Predator has an edge, but there’s always many aliens and the bastards gang up all the time 
Who won? Well, in theory the Predators won, but the end might suggest otherwise. At the end of the day, there’s still Aliens and Predators in space, none on earth!
The suspense is that if the Aliens reach the surface of the planet, it’s the end of our civilisation! Predarors are only hunting us for sport, but the Aliens would become an epidemy and would east us alllllll!!!
Oh. okay. So it’s like in Jurassic Park when the T Rex chomps the velociraptor, saving the imperiled humans.
Come now, if either of them won, there’d be no sequel! 
This movie concept reminds me of those old Japanese monster films where the more popular monsters were serially pitted against each other in hugely improbable ways…When they got tired of a monster acting alone running around trampling towns and flinging buses and whatnot, all they had to do was create its robot evil twin, and inexplicably turn the evil monster into a good monster for a few more films. Those were so desperately bad they were hilarious, at least for a few minutes (or longer, depending on your blood alcohol level).
At least now there’s CGI so the possibilities of following the Japanese model are endless: “Predator vs Species,” “Alien against Progeny,” like that. Whooo-hoo! I feel a screenplay coming on…
How about…
Predator vs Dick Chenney?
scary!
Why is that scary? After all, Predator sold all his stockholdings before the match.