With the unveiling of the M3 Saloon, M4 Coupe, and 4 Series Convertible, it’s safe to say BMW had an eventful September. There are still several members programmed to join the lineup, with one of them being this M4 Convertible. Our spies managed to get up close and personal with a near-production prototype that was out testing in the rain, far from being the ideal conditions for driving a convertible.

Having seen the M4 Coupe and the M440i Convertible, you don’t need a crystal ball to predict what the swirly camouflage is hiding. This test vehicle had the regular quad exhaust setup, but we know there’s going to be an optional M Performance setup with the end tips mounted in the centre. The enlarged grille looks just as polarising as it does on the versions with the fixed roof, and we’re anxious to see it in real life.

Gallery: 2022 BMW M4 Convertible spy photos

The oily bits should mirror those of the already revealed M models, meaning a twin-turbo straight-six 3.0-litre with 473 bhp (353 kilowatts) and 406 pound-feet (550 Newton-metres). Step up to the Competition version, which are the only versions available in the UK, and BMW will reward you with 503 bhp and 479 lb-ft (650 Nm). Both flavours send power to the rear wheels, but the automatic-only Competition will get an xDrive setup with a pure RWD mode towards the end of 2021. Should you want to row your own gears, you’ll want the non-Competition model with its six-speed manual.

In the United Kingdom the M4 Coupe begins at £76,055, the M4 Convertible will be a tad more expensive. The M3 Competition starts at £74,755.

Two additional M models are in the pipeline, with the most exciting being the high-performance wagon. The first-ever M3 Touring will give competition to other German hot wagons like the Audi RS4 Avant and Mercedes-AMG C63 Estate. But before the long-roof version arrives, a fully electric 4 Series Gran Coupe likely dubbed i4 M has already been confirmed for a 2021 debut.