While still heavily masked and fitted extensively with pre-production body panels as on previous sightings, the prototype, snapped by the walkoART YouTube page with additional winter testing images being published by motor1.com, features the same thin strip indicator likely to also serve as the LED running light as the E-class, while the partially revealed taillights are similar to those of the GLC.

Set to slot in between the GLA and GLC and provide seating for the five, the GLB will ride on Benz’s MFA2 front-wheel drive platform that also underpins the new A-class hatch and sedan, although some models will also have the option of 4Matic all-wheel drive.

Expected to feature the same interior as the A-class and more than likely incorporate the MBUX infotainment system, the GLB’s assortments of powerunits, unknown until now, could consist of the 120kW/250Nm 1.3-litre turbocharged petrol co-developed with the Renault-Nissan Mitsubishi Alliance, the 165kW 2.0-litre turbo-petrol and a 1.6-litre turbodiesel that makes 85kW/260Nm.

Despite not being confirmed, the rumour mill has started turning in that the GLB could spawn an AMG model, with the likeliest of engine options being the imminent A45’s 298kW 2.0-litre turbo combined with a 48-volt electric motor, or alternatively the similarly sized 221kW mill minus the electric unit that will power the A35.