Mercedes-Benz has officially unveiled the Vision Mercedes-Maybach Ultimate Luxury concept at Auto China following a leak last week spilling key information about the concept. We can confirm that the Ultimate Luxury concept is a fully electric vehicle with four motors producing 750 horsepower. An 80-kWh battery provides a range of over 200 miles (about 500 kilometers on the European test cycle) - much less than the 310 mile figure we reported last week. A fast charge system can provide 60 miles o