In this video you will see 2 different Gran Coupes, the BMW 640i Gran Coupe and a BMW 650i Gran Coupe M-Sport all undergoing Performance Testing at the Nurburgring. The BMW Gran Coupe allows for more space and 2 extra doors the the new BMW 6-Series. Unofficially the BMW Gran Coupe will début nearer 4th quarter of 2012 and to be sold as a 2013 model. As expected power plant units offered will be similar to what's offered in the Coupe and Cabriolet.
Video Source: Bimmerpost