Thinking that the title was Aliens vs. Predator vs. Requiem, I was understandably disappointed when this trailer did not feature an Alien fighting a hopped-up Ellen Burstyn and Jared Leto. Barring that misunderstanding, I think you'll be pleasantly surprised with this little preview. Like a porn star's demo reel, it wisely avoids revealing too much acting or plot and focuses on the parts you wouldn't want a mother to see, along with occasional screaming.
You can see a higher-quality version at the official site, but you'll have to either be 17 or have the math skills to enter a birth date that would pretend as much. Thanks for the tip, Metzger.
Alien vs. Predator - Requiem [Official Site]