I want to add one important piece to the "is Scream a possibility" discussion.
I fear that licensing for that franchise (especially the name) is currently a mess.
This is all just speculation on my part, but fully based on observations on what other companies have done recently.
If you look at the recent NECA action figure releases, as well as the shirt line that Cavity Colors put out a few weeks ago, the name "Scream" doesn't appear anywhere near any of them. It is strictly "Ghostface".
Why? I'm not 100% sure, but it could be that they would have to pay double the licensing fees. One to the "Scream" rights holders, and a separate one to Fun World for the use of the Ghostface mask. So, they choose to just use the mask, since that's really what people care about anyway (and that one may be the cheaper option).
So...what does that mean for HHN? Universal has a ton of money that they're willing to put into the houses and zones for HHN. Does that mean that they're willing to try and navigate double licenses, and the murky waters that come with that (branding, use on merch, etc)?
If my assumption is the case, I think it may actually be far more likely to see a "Ghostface" house than a "Scream" house. That would mean that they would also have to try and navigate what the individual scenes inside look like, so they're not TOO similar to ones seen in the movies.
TLDR: Uni may have to pay twice to use a Scream/Ghostface licensed house at the event, if that's even possible.