New four-door model looks to provide a sportier alternative to the 7 Series, and should share its powertrain options with the two-door 8 Series range.
The exterior of the BMW 8 Series Gran Coupe has been leaked a few weeks ahead of its expected debut.
Under the skin, the 8 Series Gran Coupe has the same CLAR platform used by almost all of BMW's rear- and all-wheel drive models.
The Gran Coupe's selection of drivetrains will, in all likelihood, be shared with the two-door 8 Series range.
Global launch models should include the M850i xDrive with a 390kW/750Nm 4.4-litre twin-turbo V8, and the 840d xDrive with a 235kW/680Nm 3.0-litre turbo-diesel straight-six.
At some point in the future the 8 Series Gran Coupe range should be topped by an M8 Competition model, which like the coupe and convertible, will be powered by a 460kW/750Nm 4.4-litre twin-turbo V8.