Development of the next-generation W223 Mercedes-Benz S-Class continues ahead an expected reveal in 2020, with more mules being spotted by our spy photographers.

Just like before, there’s a boatload of camouflage to mask the sedan’s design details although we do see the front grille now extends lower into the front bumper. The headlamps are also sharper in appearance and are placed further down compared to on the current W222 S-Class.

Viewed from the side, the profile doesn’t appear to undergo any radical changes although the brand has curiously decided to put “boxes” on the prototype’s door handles. A clear crease is seen running the length of the body, tucking in beneath the side windows.

Moving to the rear, dummy light covers hint at clusters that adopt a horizontal layout compared to those on the current car – a trend noticed on the company’s newer models. A large rear window and dual exhaust exits are the other clear cues on the mule, discounting the cutouts for the car’s sensors.

We also get our first look at the new S-Class’ interior, which is largely covered up because this is still early stages in the vehicle’s development. In the front of the cabin, there’s only one display for the driver without a secondary unit joining it.

This could be a departure from the company’s love for ultra-wide, dual-screen panels, or just a product of being an early development model. The same can be said of the air-con vents that are placed abnormally high here. The rear of the cabin is equally as concealed, with some makeshift pillows and a large sunroof being the primary highlights.

The new S-Class will be built at the company’s Factory 56 facility, and should come with a range of six- and eight-cylinder engines. Hybrid variants should be included in the mix too, although we’ve yet to sight a mule with a charging port.