Based on the initial hints, I'm leaning towards Jurassic World (hear me out).
A bunch of fans requested it last year, and Murdy said that he thinks it would be awesome, but it would be tough because of budget constraints. If the HoH replacement ends up being a year-round haunt, that would be separate from the HHN budget, which could open the door for more ambitious mazes (assuming the same amount of money from last year is making up the total budget for 5 mazes instead of 6).
In the film, the boys are from Wisconsin, and there are a few minor references to it in the film. That would be the connection.
The crazy original content (which I believe is the ending, since he tweeted about an original ending a few days ago) could be a darker twist (like how he ended This is the End in Hell instead of Heaven. That being said, perhaps the maze wouldn't end with everyone being ok, but rather it escalates even more.
For the cameo involving the El Cucuy wig, perhaps he could be shooting video footage as either a Jurassic World scientist or a news reporter covering the crazy events happening on the island.