My thoughts:
I don't want to see another AVP movie just so there can be another AVP movie. Fox seemingly makes these films now to make a little bit of money. I can only imagine how atrocious Requiem would have been without the Brothers Strause. They may have actually saved the franchises by not making Requiem as bad as it sounds Fox could have made it.
If anyone comes up with something new, original, and good for a Predator, Aliens, or AVP movie I would love to see it made. However, it must be made well...Fox is simply just going to have to open up the wallet on this one. No more crappy scripts and actors. Hire some decent talent, produce a decent movie, and make some decent money. I wouldn't mind if the brothers come back to direct another movie in either series. I think Requiem could have been so much better, but I still enjoyed it, and I think the control and ideas Fox seemed to have forced on the Brothers and the fact that it was their feature film directorial debut made it what it was. Anything down the road I think will be much better.
I personally would like to see an AVP3 movie based on the 1999 PC video game. If I am not mistaken (it's been awhile since I've played it) the company had built a research/military installation to study the aliens, complete with an alien nest/hive. The story begins when a predator arrives and complicates things.
I think it would be neat if the company had built such an installation around the derelict ship on LV-426. That is assuming it was not destroyed during the explosion of the processing plant during 'Aliens'. That might be possible considering the distance from the plant and the unknown alien ship technology. So after the company finds out that Burke and the Marines failed to complete there mission, and that Ripley destroyed herself on Fiorina 161, they build this research installation to study the aliens. Set possibly 10 years after 'Aliens'? How far in the future did Alien 3 take place after Aliens? Anyways...a predator or two shows up, busts loose the aliens. So we have the aliens spreading out and trying to wipe everything out, the predator on a hunt, and the humans trying to survive somehow. USCM Marines would of course be involved, as well as company staff. Heck, you could even have a predalien show up. The movie would end with the destruction of the facility and the derelict...with everything destroyed it would then make sense that the United Systems Military decides to try and clone Ripley in AR, maintaining continuity.
That's what I am hoping for. I realize this would be expensive, but a quality movie could attract the crowds seen for the Alien, Aliens, and Predator movies. I like long movies too, and would hope for a longer epic type film.
Two other things, I wonder if a comic book style / special effect heavy filming style such as used for '300' would make the movie better? You have to admit, it would be cool given the roots of the AVP series. Also, I feel that these movies have lost the scary aspects of them. Alien, Aliens, and even Predator were all scary movies, at least when I first watched them. When I saw AVP-R the other day, I was just not scared, maybe it is just that I am too familiar with the movies, but I didn't get the sense that anyone else in the theater was scared either. It really shouldn't be too hard, I saw 'I Am Legend' last week, and I have to admit, I was scared at points in the movie. Bringing back this 'feel' to the franchise is a must if another movie is to be made. Aliens coming out of nowhere, fast shocking scenes...I dunno, I don't feel it is really that hard to do.
Anyways, thought I would share my $0.02. Share you thoughts on the subject, or just let me keep blindly awaiting my ideas to come true haha.