The automaker claims the luxury ride — with the option of either five-seater — combines the "body design and technical basis of the GLS with the luxury of a top-class sedan," according to the automaker. And for the first time, the automaker has placed electric features in its 4.0-liter V8 bi-turbo engine: a 48-volt onboard EQ Boost with an integrated starter generator helps increase the horsepower of the car.