BMW recently updated the 4 Series coupe and convertible for the 2018 model year with new standard LED headlights and reshaped bumpers to freshen up the styling as well as improved handling thanks to stiffer suspension. A next-generation model is just around the corner, and our spies have sent us the first images of the all-new BMW 4 Series Convertible loaded on a transport truck.

BMW seems to be going back to its roots, as the new 4 Series Convertible prototype has ditched the current model's arduous folding hard top roof for a more stylish soft top just like the new Z4. As well as improving the looks, the soft top will make the new BMW 4 Series lighter and cheaper to produce, while offering more luggage space when the roof is open.

The prototype is extensively covered in camouflage preventing us from getting a closer look at the details, but the grille appears to have the same shape and size as the one found on the new Z4. We wouldn't be surprised if the front and rear fascias share styling cues with the reborn 8 Series.

The new 4 Series Convertible will be based on BMW's CLAR platform, which should result in a significant weight reduction, a more spacious cabin, and a bigger trunk. As for powertrains, BMW is likely to continue selling the 4 Series with a choice of four and six-cylinder engines in the US.

The current model is available with either a 2.0-liter 4-cylinder that produces 248 hp and 258 lb-ft of torque and a 3.0-liter 6-cylinder with 320 hp and 330 lb-ft. Both the next-gen 4 Series Coupe and Cabrio are expected to go on sale in 2020.