Ok, I saw the movie yesterday. It was the first time I've been to a sneak preview so I didn't know what to expect. Essentially, before the start of the film they were showing information about other cool projects that were in the works. Then you have behind the scenes interviews with the cast and crews - I think these will be in the DVD's special features.
I really enjoyed the movie ... You really do sympathize with the characters, they put up hell of a fight all right! It's not often that you see a horror film where the entire casts consisted of strong and able females (who are good-looking but are not air-heads). The only complaint I have was that they changed the ending a bit. They stopped the film at about 5 minutes eariler than they did with the original and thereby changing the ending and making it appeared a bit Hollywood-ish. The original ending was about 5 minutes longer (there was supposed to be something more after the last scene) and had a twist.