_BMW _ has announced the next-generation 3 Series coupe will have a new identity and badge all of its own - and it will be known as the 4 Series coupe when it goes into production next year.

The German marque will reveal a 4 Series coupe concept in Detroit which is expected to closely represent the upcoming vehicle.

The name change wasn't unexpected, with BMW making similar adjustments with its 6 Series and 8 Series coupes.

While no engine specifics have been released, the 4 Series concept coupe is longer and wider than the 3 Series with a slightly lower roofline, which BMW says will give it a sense of individuality and mark its difference from the 3 Series. The interior follows the traditional BMW recipe, blending sportiness and exclusivity into a single package. The sporting character is also apparent in the low-slung design of the rear end.

The next-generation coupe is expected in Australia in the second half of this year.

Detroit will be a busy time for BMW because the car-making giant is also expected to show tweaks to other models making their way to Australia this year.

A third body variant of the M6 Gran Coupe will debut at the show; it will have four doors and offer greater convenience and extra interior room.

The increase in size won't come at the cost of performance however, with the sedan housing a 412kW 4.4-litre twin-turbo V8 under the bonnet.

It's also expected to arrive in Australian showrooms in the second half of this year.

One Detroit debutante set to arrive slightly earlier is the new model variant of the Z4 roadster, which is expected to have some subtle changes to its body, interior and an all-new equipment package.

A new entry-level engine variant, the 115kW 2.0-litre Z4 sDrive18i, will be produced for overseas markets. However, BMW says the sDrive20i will remain the smallest engine on offer in Z4s locally.

The West Australian

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