I'd think, more personally; smaller than BTMRR. As Skip said I believe, 7DMT wasn't bad. But the dark ride portion was far too long than it should of been, and the coaster element is..well; too short as it should of been. If we get a middle-road of it, I wouldn't be upset at all.
Speaking off, I've thought about it as a means to possibly give more space; but could it be possible that theres an Elevator lift? Its not impossible by any means, and we know that there are examples of this tech being used (Cobras, JtA SD, E.T.C) and it would give more space for coaster elements. After all, I believe the term; Vertical was mentioned about Nintendo, and that's whats popping up in my mind.