BMW's upcoming four-door 4 Series has been snapped on the streets, but we don't know how its snout will look just yet.
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BMW has been snapped testing the 4 Series Gran Coupe on European streets, revealing details about its profile and rear lights... but nothing about its grille.

The new prototype follows the Concept 4 revealed in Frankfurt. The concept, which offers "a look ahead to the expressive face of the 4 Series range" according to BMW, was dominated by its gigantic 'kidney' grille.

From what we can see on this prototype, the production 4er will have a jewel-like grille finish and a split in the middle. Although BMW's camouflage would suggest it'll have a conventional kidney and lower air intakes, we're not so sure...

Sliding along to the rear of the car, it has the same lighting signature as the concept, with slimline housings and a more aggressive diffuser than the regular 3 Series.

It rides on a set of wheels that won't make production, but the window line, vent behind the front wheel arch, and things like the door handles all look ready for the showroom.

As is currently the case, the 4 Series Gran Coupe is expected to be a slightly more practical take on the 4 Series that blends four-door ease of use with a sloping roofline. Interestingly, the 4 Series GC also appears to have more than a passing resemblance to the upcoming i4 EV.

Expect the new 4 Series Gran Coupe to be powered by the same range of 2.0-litre and 3.0-litre engines offered in the 3 Series, across both petrol and diesel. A plug-in hybrid is also likely, although BMW hasn't confirmed details.

There are also rumours we'll see an M4 Gran Coupe offered, although once again details haven't been confirmed.