Could be, but I'm thinking that the dementors is going to be the cool mist screen effect.
Someone please clarify something. Was the mist screen reported by SAS, or someone else? It seems that a lot of the information that SAS brought us was false and unfortunately a few major assumptions are based on that false information: sadly The Forbidden Journey isn't 7:33. It seems that the time isn't set yet, so I don't know how long it is, but I have been told that it will be wonderful and fulfilling and definitely sate our appetite for a truly spectacular experience, but it is shorter than the 7:33 reported by SAS.