Apparently, this movie was conceived as the first part of a trilogy. That would explain the dangling at the end.
I thought both Hayden and Rachel gave bland performances. It had a great concept and some nice special effects, but it looked like it was written and directed by a 14 year old. It didn't end in an emotionally satisfying way, it was just a quick ending. Apparently the BD of this flick looks incredible, so BD player owners should check it out.
cheers,
supervij