We won't believe you cause too many clues are pointing to at least one or two movie houses. Not to mention the bread and butter of HHN lately has been a haunt based on a movie, or last year, several movies.
Either Mummy, Freddy or both sound like they are back this year.
I don't know why you're dead set on the Mummy. A "museum" and a corpse does not a Mummy house make. Sure there may be a mummy in it, but that doesn't mean it's going to be based on the films.