Well over at Dark Horizons, they've reported that several minutes of new movie footage was shown at Fox ShoWest:

"Heaps of new footage appeared in this extended 4-5 minute trailer complete with lots of action shots, FX footage and an explanation about how the scenario of the movie is setup. The money shot at the end (an ancient temple with three predators on top and hundreds of aliens crawling up it) is sweet, as is some of the new Predator gear and the temple sets. Extremely quick cut, this looks a lot like what'll be used as the basis for the final trailer"

Check it out.