Mercedes Benz recently revealed its Concept Coupe at the Beijing Motor Show, stating that it would only be put into production if there was sufficient demand for it.
Seems Mercedes was fibbing a bit, because a test mule has been spied out and about. This car, which will likely be called the MLC, will be built after all.
No other details are available at this point, but the MLC will probably use powertrains from the ML.
An AMG variant with over 400kW on tap is also a possibility.