I saw this mule up close in Fiorano, a test driver and engineer came by and stopped for a while. Surely not a 612, a lot shorter, the proportions of the car are much more balanced.
The deck behind the seats is much shorter than a Maranello.
Interior looks very similar to a 612, if it's not identical. There are covered scoops on the sides (behind the front wheels) and on the hood. Engine sounds like it has very low inertia, sounds a lot more sporty than a 612 (and a stock Maranello).