BMW's new 2 Series Gran Coupé is due to be revealed later tonight, but official images have been leaked online to spoil the show.

The BMW 2 Series Gran Coupé has now been revealed in full. Click here to read the story

Posted by a South African vlogger Caleb J. Schroëter, the new shots show the four-door Mercedes-Benz CLA rival's exterior styling in full, with a distinct visual difference compared to the larger 3 Series and new 1 Series.

While the front-end is recognisable from the 2 Series' hatchback sibling, the rear-end shape appears to be inspired by the firm's latest coupe SUV, the BMW X4, with similar tail-lights and tailgate shape.

The need to accommodate two conventional front-hinged rear doors and sufficient rear seat leg room is said to be behind the decision to give the new car a wheelbase that's halfway between the 2690mm span of the 2 Series Coupé and the 2810mm of the 3 Series saloon.

Inside, the 2 Series Gran Coupé will sport a new interior layout that's also set to be adopted by the successors to today’s 2 Series Coupé and 2 Series Convertible, which are due in 2020.

The turbocharged three-cylinder and four-cylinder engines of the 2 Series Gran Coupé will mirror those of the existing line-up.

On the petrol side of the range, expect a 134bhp 1.5-litre three-cylinder engine in the 218i, 181bhp and 242bhp 2.0-litre four-cylinder units in the 220i and 225i, with a more potent version in the M235i. Among the diesels will be 148bhp, 187bhp and 221bhp 2.0-litre four-cylinder engines in the 218d, 220d and 225d respectively.

Like its two-door siblings, the 2 Series Gran Coupé will offer a choice of a standard six-speed manual or optional eight-speed torque-converter automatic gearbox, with xDrive four-wheel drive available as an option. However, the latter will be offered in combination with only a limited range of engines.