A fully camouflaged prototype of the Mercedes-Benz S-Class Pullman has been spotted undergoing testing.

A fully camouflaged prototype of the Mercedes-Benz S-Class Pullman has been spotted undergoing testing.

Mercedes-Benz will bring next month to the Los Angeles Auto Show the 5.5-meter long S-Class Maybach but that won't be the longest S-Class of this generation as a Pullman variant is also in the works and will reportedly be built by Brabus. Set to be 6.4 meters long, the limousine will have six doors and will probably adopt a 2+2+2 seating arrangement, with the rear seats facing each other.

Chances are the most luxurious S-Class ever spotted here testing in Germany will be offered exclusively in the S600 guise which means it will be powered by a V12 6.0-liter twin-turbo engine outputting 530 HP (390 kW) and 830 Nm (612 lb-ft) of torque.

There's no confirmed info about the price tag but a 5,300 kg (11,684 lbs) armored version is expected to cost approximately $1 million when it comes out most likely in 2016.

As a final note, our spy photographers say that on the highway the S-Class Pullman was doing around 143 mph (230 km/h).

Be part of something big