Thing is, I feel like the Mummy mazes - The Shining, The Exorcist, TrT - are usually announced early in the year, so the facade shenanigans are minimized. I feel like this year, they were trying to announce other mazes besides the cult classic (if I were in Uni marketing, I'd want to announce Ghostbusters first too), but then they forgot how blindingly obvious the facade would be. Legacy has said over on 29 that they're behind schedule on announcements, and part of me feels that part of why is that they had to shift the Killer Klowns announcement up to compensate for the obvious facade, and they weren't done editing (or possibly shooting?) the video yet. Plus, John Massari over on Instagram has been dropping some really, really obvious hints lately, which makes me think the announcement is soon, but delayed.
Otherwise, I agree that they shouldn't drop their heavy hitters really late this year, especially when they have Ghostbusters on their docket. HoTC can be dropped whenever, but Ghostbusters needs to give families enough leeway to plan their vacations, I think.