To Clarify,,I don't think we will see any HHN stuff at the WWOHP, I DO THINK that part of IOA will be open. They have an access area that they used at HHN 14 and you came in to that area from USF. I don't see them having 2 separate events, It would be a massive undertaking But Honestly YOU never know.
Also You are asking for some insane things that are not going to be done in the WWOHP are, they don't have any area to do a House except if they use were the Terror Mines were at in 15. Which is not really able to be themed at all very much. Terror Mines were mainly dark with next to no themeing.
I think we will see a return of core Houses, ScreamHouse, Psychoscarepy, All Night Drive In and Castle Vampyre. We may get another Silver Screams. I would love to see a return of Motel Hell from my first year. I hope we don't get another People Under the Stairs, Through the Mind of Norman Bates or Dungeon of Horror.
I am hoping but Doubtful that a New Icon will arise to bring the Old Icons Up. The Family Tree theme is very popular among the Guesseers and I have talked with Dr. Holmes and we think some how Carey, Oh will play a big part in the mix.