It's occurred to me we aren't really getting any truly "scary" properties this year, at least in the traditional sense...
Trick R Treat is decidedly horror comedy.
Stranger Things is more horror-adjacent than straight horror (nothing in the show is particularly *terrifying*).
Universal Classic Monsters could've been scary in a Gothic creepiness sort of way, but the inclusion of rock music will turn this into a more of a rave/"experience.
First Purge, the movie, is barely a horror flick - it's more of a Blaxploitation political satire. It's in no way scary.
Truth or Dare/Unfriended don't really require an explanation.
Poltergeist comes closest, but it's still a family-friendly horror endeavor that's more Haunted Mansion-spooky than full-on terrifying. (There are definitely moments - the clown, bodies in the pool - that are "scary.") Halloween 4 could potentially be "scary" in the sense that Michael Myers is "scary" by default, but he's likely going to be in an environment divorced from what's typically compelling about the Halloween franchise (i.e. the first and arguably the second movie).
Even the announced & rumored zones aren't terrifying in tone. Holidayz of Horror are fundamentally silly/over-the-top, as is Killer Klownz.
Maybe we need to accept that Halloween Horror Nights isn't supposed to be scary this year. Stranger Things's inclusion certainly hints at that directorial shift.