Leave it to Fox to ask for a date, then not show up. According to the LA Times, Fox has pulled out a number of its coming features from the San Diego convention where every major studio is set to give sneak peeks at their upcoming films, virtually all of which have nothing to do with comics oddly. Though I suppose AvP 2 might count, it doesn't anymore because that's one of the properties that's been pulled, along with Vin Diesel's new flick Babylon A.D., and the movie based on video game Hitman.
Says Fox quoted from the Times, "The material wasn't ready and we only want to go out when we can put our best foot forward." Yeah, I don't buy it either. These studios aren't showing entire flip segments or even standard trailers as far as I know, just snippets from what's been shot so far. I've read that J. J. Abrams is supposed to be showing bits from the new Trek film as well, which I still don't understand since it hasn't even started filming yet, as far as I know.
Rotten Tomatoes, where I picked up on this story, references chud.com which thinks this all has to do with Comic Con's dislike for R-rated material, although I find it hard to believe that Fox couldn't fix 30-60 seconds worth of PG-13 material in 2+ hour films to show.
Something else is at work here, I just don't know what.