I honestly believe that if Trick 'r Treat does come next year, it's most likely going in Water World. Not to bash the movie, because I really love it, but when you really boil it down to maze potential, the four short stories don't have too much to go off of. Scareactors will basically be the Principal, undead trick or treaters, Sam, and puppeteers for the lady werewolves. If the other properties (IT, The Conjuring, Stranger Things, The Thing, Hellraiser) do come next year as well, it would make sense that they give those IPs the maze locations that can utilize larger effects and bigger environments.