Last week BMW unveiled the Concept 4 Series Coupe, ahead of its public debut next month at the Detroit Auto Show.
The concept previews a production model that will follow soon.
Our latest spy photos show the BMW 4 Series winter testing in much less camouflage compared to previously seen prototypes. The prototype looks very similar to the concept, though it is hard to tell yet will the lights, bumpers and grille be identical to it as there is still some disguise hiding the final details.
Engine range is expected to include only the top units found in the 3 Series saloon. There will be also an all-wheel drive version and the range topping M4 will use a turbocharged 3.0-litre in-line six-cylinder with around 450bhp.