I doubt Unleashed will go this route, but Fright Walk at Santa Cruz Beach Boardwalk, and Frankenstein's Castle at Indiana Beach have literally no scareactors at all. It's all just automated and themed funhouse style scares. And both were pretty good for what they were.
In fact, Frankenstein's Castle has a very memorable moment to me where at one point you enter a room that is
all doors... and all of them actually open (most to passageways, though there's one or two blank walls). It was crazy to stay there and figure out which way to actually go. Not my pic below, but you get the idea.
View attachment 25406
I do suspect Unleashed will use live scareactors, as it's what their known for. But I won't be surprised if it won't be as many as we maybe think.