The coupe version of the sixth-generation F30 BMW 3-Series sedan has been spotted once again in prototype form at the Nürburgring, and we have a new spy video of it running some hot laps around the German race track.

The new two-door, code-named the F32, is due for a reveal late this year ahead of a sales launch in the summer of 2013.

To help further differentiate its two-door models from its four-door lineup, as well as allow for the introduction of a range of new models and bodystyles, BMW will be adopting a new naming nomenclature where its sedan models stick with the odd-numbered names they currently use and sportier coupes and convertibles use even numbers.

This would mean the new 3-Series Coupe will be renamed a 4-Series Coupe, while the smaller 1-Series Coupe will be renamed a 2-Series Coupe for its next-generation. This would also mean that the M3 Sedan would remain an M3, though the coupe and convertible versions would be called the M4 Coupe and M4 Convertible respectively.

Whatever the outcome, one thing’s certain, the 4-Series Coupe should remain a distinctively stylish and well balanced car. The prototype seen here shows very similar proportions to the current model, meaning its styling will be more of an evolutionary shift rather than a complete redesign. There’s even some subtle hints from the E46 coupe, as can be seen by the taller rear, which also appears squarer than the one on the current model.

As for the engine lineup, expect the same 328i and 335i designations from the sedan to filter across to the coupe. This means a 240 horsepower 2.0-liter turbo in the 428i and a 300 horsepower 3.0-liter turbo in the 435i model. Transmission choices should include a standard six-speed manual and optional eight-speed automatic.

As mentioned, the new 4-Series Coupe should land in showrooms during the summer of 2013, about the same time the new 4-Series Convertible arrives.