As with the Coupe version, the GTC Speed is driven by a twin-turbo 6.0 litre W12 engine producing 460kW and 800Nm - just 3kW shy of the Supersports hero, and equal for torque.
Power is sent to all four wheels through ZF's eight-speed automatic transmission and a Torsen centre differential.
Full details on the GTC Speed are still to be revealed, but in the Coupe, that combo produces a 0-100km/h time of four seconds. The topless Speed won't be far off, and expect a top speed around the 330km/h range.
Other tweaks include a widened track, sharper steering, a rear-biased revision to the all-wheel-drive system, and a 10mm-lower suspension setup.
In the cabin, we can likely expect to find the Mulliner Driving Specification package, with wood and metal highlights, leather throughout and top-shelf carpeting.
The Coupe's options list includes carbon ceramic brakes and hand-threaded top stitching on the seats, and those should come to the GTC also.
Styling tweaks are minimal, although there's a shadow tinted grille and lower intakes at the front, and a "rifled" finish to the exhaust tips.