“The SLS looks smaller than Mercedes’ current supercar, the SLR McLaren, but the smaller shape just hints at extensive weight saving measures. An all-new aluminum space frame contributes to a curb weight of just 3,571 lbs, a full 300 lbs less than the SLR McLaren. The SLS also rides on a long 105.5-inch wheelbase with a front track that’s 1.2 inches wider than the rear.
Power will be provided by a tuned version of AMG’s familiar 6.2L V8 producing 563 hp at 6,800 rpm and 479 lb-ft of torque at 4,750 rpm. The engine, which sits low and behind the front axle, will send all that power across a carbon-fiber driveshaft to the rear axle where a new seven-speed dual clutch gearbox carves it up. There will even be a Race Start launch control function that guarantees an estimated 3.8-second 0-62 time every time. Top speed: 196 mph. Stopping? 15.4-inch discs in front squeezed by six-piston calipers and 14.2-inchers with four-piston calipers out back, and a full set of carbon ceramic rotors will be optional.”
Note that the new supercar will drop the McLaren moniker, as a result of the Mercedes/McLaren split on the production of road cars. Autoblog also has lots of pictures of the two prototypes as released by Mercedes. I wonder if those are still modified Dodge Vipers as the early prototypes were.