The BMW 1 Series continues its very slow reveal in new spy shots that show the hatchback testing with its production lights. Heavy camouflage continues to conceal the rest of the model's appearance, though.

This 1 Series test mule features illumination with angular LED running lights. The design simultaneously harks back to recent BMW concept cars and even the company's older use of circular headlights – the golden era, as it's not really known.

At the back, BMW has fitted rear lights with L-shaped central sections. The design of the units picks up similar cues from the rest of the German car maker's lineup. 

The rest of the 1 Series test mule features wide openings for the company to place the kidney grilles. A slight rake on the hatchback gives the rear a sleeker look, too. Inside, earlier spy shots revealed that the 1 Series is available with a fully digital instrument panel and an infotainment screen that seems to integrate into the central portion of the dashboard.

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Gallery: 2019 BMW 1 Series interior spy photos

The new generation of 1 Series will make the switch to BMW's UKL front-wheel-drive platform. Some models will possibly be available with all-wheel drive, though. The hatchback will only be available in a five-door configuration, no three-door format this time round. Changing layouts will limit the available powertrains to three- and four-cylinder engines. There won't be a full M version, but the range-topping M140i will pack a 2-litre turbocharged four-cylinder motor.

Keep an eye out for a 1 Series premiere later on in 2018 – BMW is revealing its new X4 SUV at the 2018 Geneva motor show, so we could be looking at October's Paris show for the big unveil. Certainly the new 1 Series will arrive hot on the heels of its closest rival, the new Mercedes A-Class

Gallery: BMW 1 Series spotted with production rear lights