Rumors of BMW planning to build an M7 have been floating around for quite a few years, but Munich has yet to offer a high-performance version of its range-topping limousine as of 2016. The Germans did launch the M760Li xDrive model for the 2017 model year with 600 horsepower, but the sedan isn’t a full-fledged M car. That may change in the future though, as BMW has announced plans to expand its range for M-branded models in March 2016. And with what appears to be a mule of an M7 already spotted on public roads