Here is a picture of the upcoming Mercedes GST model which will appear at the end of 2004. The car will be produced in the Alabama factory in the USA right where the M class is currently produced.
The model has been conceptualized as a cross between a car an SUV and a van. It will probably have three rows of seats and will accomodate 6 people.
The prototype appeared last January in Detroit Auto show and was powered by the AMG V8 5.5 liter engine producing 360 HP. It is questionable wether this engine will power the actual car though.