I was kind of thinking the same. Gremlins or Creepshow. Replacing an IP with an IP. Only problem with those 2 is that it's kind of a "back to the 80s" deal having one of those alongside Beetlejuice - and we've kind of worn through the 80s deal the past couple of years.
Other potential ideas:
1 - Stranger Things season 4 seems obvious if it indeed releases in August. Problem is the Soundstages are already accounted for, and I don't see them sticking a big IP like ST into Shrek. I think ST4 only comes if one of the other designated Soundstage houses needed replacing (which according to
@Legacy is unlikely).
2 - Silence of the Lambs. Was rumored to be a possibility a year ago. It's a 90s movie, so that breaks up the 80s stuff. And that movie is largely about claustrophobia, so having it in Shrek isn't too far-fetched. Problem is that it's a pretty big IP, and cost is going to be an issue this year for Uni.
3 - Recent, smaller IP like Terrifier or You're Next (or others). I've made my feelings known on Terrifier here - I think it would be an amazing house, and the sequel is coming out this year. Art the Clown merch I think would sell pretty well based on the fact that I wore my Art the Clown shirt to HHN Lite and had no less than 10 people stop me to ask me about it or comment on it. The settings (pizza parlor, apartment building) are naturally smaller in stature, so Shrek would work for it. I don't think Epic Pictures has any issues with Uni. You're Next would give us a slasher (with creepy masks) that takes place in a house - similar to Halloween 4, so we know that could fit in there. And it's a Lionsgate film, so Uni should be alright there I think. Either of those (or another smaller recent IP) would give us a more recent horror IP that isn't so big that it would cost a lot, but gives us some decade diversity.