None, the only one that could maybe be a full maze was slasher
I gotta' agree with foodstamps here, as I've said before Slasher's SK room felt like a nice pre-show to a maze. An' it's certainly a concept that can work just fine as a full blown maze.
As for the other three, they were more self contained as a little experience.
Zozo - I honestly don't see how they can expand that beyond what was shown, the entire theme/concept revolved around summoning Zozo from the Oujia board.
For both Visions and Prey, you could make the experiences larger...but not as your normal walk through maze. The augmented reality tech of Visions is pretty much contained to exploring a room or two, where you have the time to stop and hold up the tablet to something for it to work. Can't do that in a maze where you have to keep moving.
As for Prey, while they showed off the lanterns, the focus on that was finding your way out. So that concept can't be a regular maze, it has to be a upcharge experience no matter what. Now as for the lanterns, you could apply that alone in a regular maze...which is exactly what Trick or Treat: Lights Out is doing with the flashlight tech.
*UPDATE*
Looks like over at Midsummer Scream, Knott's has a booth where they're showing clues for this years new mazes. An' thanks to the Theme Park Duo, we have pictures of those clues.
For this first batch of clues, kinda' hard to say. With the tickets it's probably some sort of theater, perhaps a puppet theater?
Now for the second batch of clues...
I think we're going to have a throwback/update to the classic Mother Nooses's Scary Tales maze from 1992.