These photos show a typical test mule using a chopped up 599 GTO body but with the new chassis and powertrain.
Of course the F152 (a name which will change for the production version) will look very different when it's released.
The mule is said to be powered by a modified version of the great 6.3-liter V12, with sources suggesting it will get direct injection and remain rear-wheel-drive only.
Power is expected to climb close to 520kW or above, being pumped through a new seven-speed dual-clutch gearbox.
Where the FF is more the family orientated family car for everyday use, the 599 successor will be the true super sportscar thanks to its construction from aluminium and carbon fibre.
Expect the production version of the F152 to debut next year.