It was just over a month ago when we caught a camouflaged prototype of the upcoming 2020 Mercedes E-Class facelift stopping for gas, but development of the updated mid-sized luxury sedan appears to be moving along rapidly.

For the first time, our spies have managed to snap some photos of the interior, and the changes are immediately apparent. The biggest change is the addition of a completely new redesigned steering wheel, which has also been seen inside prototypes of the next-generation S-Class.

The bottom V-spoke design now flows directly towards the inner edges of the side spokes, which look sharper and are now angled inwards. The wheel's center hub is also a lot smaller, providing extra visibility for the digital gauge cluster. Elsewhere, we can also see a new touchpad, and, presumably, the latest version of Mercedes' MBUX infotainment system.

As for the exterior, the updated E-Class is getting a new front-end design with a new grille and headlights to make it more closely resemble the new CLS. At the back, the prototype now sports production taillights, although we're expecting them to cross over into the trunk lid area as they do on the CLS and the new CLA. According to our spies, the prototype doesn't have the correct truck lid, which is why the rear doesn't look completely new.

We're not expecting the Mercedes to get any powertrain changes, but we'll have to wait for the official reveal to find out if Mercedes has done any tinkering under the hood. In the US, the current Mercedes-Benz E-Class is available with a 2.0-liter turbocharged four-cylinder engine that produces 241 hp or a 329-hp 3.0-liter twin-turbo V6 unit.