The problem is when you put these franchises together you automatically think it needs action and guns,
but the origin of Alien is survival horror the origin of Predator is action and suspense.
I think the best option that will work is wright purely an Alien movie, with its characters etc
then start putting in a predator or predators put the focus on the alien development and mystery and just add a predator that undermines the situation at some points and works on its own agenda to get what he or they wants.
AVP focussed too much on three parties humans, aliens and predators.
The humans in AVP:R had the leading role but nobody cared about them lets be honest, the aliens where the bad guys but never gave me the feeling they where so bad and evil, just some cannon fodder and then the predator hunter Wolff although cool looking,
at moments the movie gave me the feeling he was the leading role so it switched a lot to who is the hero who is who, who do i care for and in the end its WTF am i watchin here Bert??
And AVP was better to watch but still Anderson had no balls and feel for the predator and he lacked the passion for the alien universe so we ended up with another Resident Evil movie type, not bad to watch but not in place whatsoever.
And somebody said they should use the people from the Underworld series, if you do that you will get one big shit hole of a movie,
the Underworld series is weak in every way they are even beneath Anderson, sorry for the hating but wake up.