Recent video footage showed the M850i version being tested to the limits at the Nürburgring, but the patent images, which surfaced on tipster page Ferd, show the range-topping four-door coupé in its hottest guise.
Previewed by the M8 Gran Coupé concept back at the Geneva motor show in March, the Porsche Panamera-rivalling 8 Series Gran Coupé isn't due to arrive until 2019 - several months after the two-door variant. The M8 version arrives a few months after this.
The M-performance M850i will be offered in £76,270 840d diesel and £100,045 M850i petrol form, and the Gran Coupe is predicted to follow suit. The production M8, meanwhile, is tipped to top 600bhp from a more highly tuned version of the same engine and will be available in all three 8 Series bodystyles.
The Gran Coupé is due to enter production in 2019. It appears largely similar to its two-door siblings, but with a raised rear roofline to provide more head room in the rear seats.
Following the unveiling of the 8 Series coupé, the convertible and Gran Coupé were all but revealed in patent images showing their distinct designs. The pictures, which surfaced on Bimmerpost, confirmed the car's look would follow its two-door siblings closely at the front and rear.
Pictured previously during a testing stint at the Nürburgring, the design differences of the M8 coupé and convertible are visible. Aside from their differing tops, the variants also get their own bootlids to create different silhouettes.