How is AVP paranormal/supernatural?.,... its sci-fi horror.
Also, I wouldn't put too much stock in the "one main theme" idea for the event. Murdy doesn't like to do that kind of thing, that is more of an Orlando type of thing. It's only coincidence. Also, its not new to the event, an overall theme was attempted very loosely in previous years when the event returned in 2006 indirectly with the use of icons (something else Murdy doesn't seem to care for). The Director in 2006, Jack the Clown in 2007, Freddy Krueger in 2008, Jigsaw in 2009... So it has been done, but not well because as I said, its not Murdy's thing. Which is a shame because the Terror Tram could be the anchor, like it sort've was.
As for the entrance scarezone, "nonhuman" doesn't automatically mean something paranormal/supernatural either. It could very well be aliens, cyborgs, or some other non-human monster "that hates humans".