2013 BMW 6 Series Gran Coupe spy shots

BMW is using the design elements of its latest 6 Series to create its first foray into the four-door coupe world with this, the 6 Series Gran Coupe. We'll likely see the finished product at the Frankfurt Motor Show in September, and judging by these latest spy shots, the big four-door is indeed nearing completion.

Much like the 6 Series coupe, we can expect the Gran Coupe to launch in 650i guise, powered by BMW's 4.4-liter twin-turbocharged V8, with a six-cylinder 640i model following shortly thereafter. In any case, the Gran Coupe will go head-to-head with the Mercedes-Benz CLS and Audi A7, and we're eager to see how the big sedan looks with all its camouflage removed.