BMW has been caught testing the upcoming 2013 model BMW 6 Series Gran Coupe out on public streets once again. This time the prototype is showing more detail than ever, including new wheels and an exposed front end.
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The BMW 6 Series Gran Coupe will be BMW's answer to the Mercedes-Benz CLS and the Audi A7 Sportback, showcasing a long elegant four-door coupe layout. The 6 Series GC will be based on the new 2012 model BMW 6 Series Coupe and Convertible, and is likely to be available in the same trim levels.

Engine variants are also said to be similar to the BMW 6 Series, including the 3.0-litre TwinPower turbo-diesel straight six, as well as a '650' badged flagship variant sporting the 4.4-litre twin-turbo V8 petrol.

From these shots we can see the new BMW 6 Series Gran Coupe will feature a swoopy four-door layout with a extended raked rear windscreen. The GC will also showcase very similar front end styling to the normal BMW 6 Series, offering that pronounced upper grille which seems to be a part of BMW's new design philosophy.

The 2013 BMW 6 Series Gran Coupe will go on sale sometime next year after being unveiled at one of the big international motor shows either at the end of this year or the start of 2012. We'll keep you updated. In the meantime, feel free to tell us what you think of the new model.

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