Here is the trailer from Bloody-Disgusting.com, it's in good quality & one of the better places to watch it.
I am literally shivering with joy in front of my computer at the moment, that trailer was literally the greatest thing I have seen in years. Any doubts I had about the movie literally went flying out the window once I started watching it. The predator & aliens both look fantastic, & it has now been confirmed that there will be a Queen in the film. From the slight glimpses we got of the predalien, it looks fantastic as well.
The predator is obviously experienced, & it shows, I couldn't contain my excitement in the scene where he had a pair of aliens by the throat & lifted them both off their feet... this movie hasn't even been released & already it looks set to bump both Predator & Aliens down a notch...the Strause Bros. are my new Gods.