4-door coupe is derived from the BMW Gran Coupe Concept that debuted last year and will be built on the 6-Series platform.

These images of a BMW 4-door coupe have been leaked from a patent office somewhere and fallen into the hands of our intrepid colleague over at Carscoop.

The images show a 4-door coupe, based on the Gran Coupe Concept that debuted last year, that will compete against the likes of the Mercedes-Benz CLS and the Audi A7 Sportback.

In the sketches there are some design changes to the front fascia and rear lights which are to be expected as the model makes its way through the production process.

The as-of-yet unnamed model is set to go to production next year. What will it come to be called?

Well, as it's based on the 6-Series, it could be the 6-Series Gran Coupe or the 6-Series Gran Turismo.


Gallery: BMW 4-door coupe patent sketches leaked