Oh, went to the Orlando one during 2010 - absolutely brilliant! My only regret was that I didn't have anyone with me. You really need a friend to experience it properly.
They convert the entire park over for several evenings. They plan it virtually the moment the last one finishes, which means they've had a whole year to work on it. The exteriors has several 'zones' and then they convert certain interiors to haunted house-like experiences.
Sounds like this will be one of the interiors which is made up and converted.
Truly wish I could have gone to this one.