It is still covered in plenty of camouflaging though, with a big fibre-glass bonnet shield and a similar arrangement on the boot to disorient onlookers.
Although the name suggests otherwise, the new SL63 will feature the new 5.5-litre twin turbo V8 and not the old 6.2-litre.
From the side we can see the new Merc will feature a huge braking package, including six-piston calipers and cross-drilled discs front and rear.
The back of the car doesn't look as aggressive as the AMGs we've come used to.
On this test car Mercedes-Benz has done a great job of hiding the usual quad-exhaust pipe setup though. The road-going version is likely to offer a more flamboyant arrangement.
Power on offer is said to be around the 426kW mark whilst torque will be at around 900Nm. This will be sent through a Mercedes-Benz seven-speed MCT Speedshift automatic gearbox.
The 2012 Mercedes-Benz SL63 AMG is expected to debut some time in 2012, but we'll bring you more details as they come.