Imagine Disney's reaction to a horror movie filmed guerrila-style (think 'without permission') at their theme parks. Think they'd do anything to prevent the release October 11th?
Disney knows about the movie "Escape from Tomorrow" that was indeed filmed without their permission or knowledge at their theme parks, but they're not going to try and block it because they don't want to give it any more publicity.
Judging by the trailer, it could either be campy great or campy horrible. You be the judge.