BMW has officially unveiled the new M6 range during the weekend with the new Coupe and Convertible scheduled to show up their faces at the Geneva Motor Show in March.
Both versions extract power from the company’s 4.4-litre V8 (the same that is found in the new M5), meaning that their respective output is 560 HP (412 kW) and 680 Nm (502 lb-ft) of torque, figures which translate into performance via a seven-speed M Double Clutch transmission (M-DCT) that spins the rear wheels and an Active M Differential.
So when pressing the gas pedal the 2013 BMW M6 Coupe takes 4.2 seconds to go from 0 to 62 mph (100 Km/h), (4.3 seconds in the Convertible) and 12.6 seconds to rocket from 0 to 124 mph (200 Km/h) / (13.1 seconds in the Convertible).
Both models have a limited top speed of 155 mph (250 Km/h) or 189 mph (305 Km/h) for the versions equipped with the M Driver’s pack and in terms of fuel economy the Coupe is capable of returning 9.9-litres per 100 Km (23.7 US mpg) while the Convertible will average 10.3-litres per 100 Km (22.8 US mpg). 
In order to keep the new M6 as light as possible the Bavarian car maker has applied several weight saving measures like for example the carbon fiber-reinforced plastic roof fitted on the Coupe, the aluminium made doors and bonnet or the thermoplastic side panels.
In terms of appearance the 2013 BMW M6 range looks a bit more aggressive than the regular 6-Series due o the discrete aero package that adds new bumpers, new side sills and a rear diffuser, as well as due to the quad tailpipe exhaust system and the 19 inch alloys (20 inch optional).
The new M6 series also features a revised grille and LED headlights while under the skin the cars feature a sport-tuned suspension, a high-performance braking system (M Carbon Ceramic brakes optionally available) and the M Servotronic power steering. 
The 2013 BMW M6 Convertible will become available at dealerships across the US in June while the Coupe will follow later this summer.

Source: BMW