IMHO way too polished to be a mule. Could be a side project car that has no production intent. Also very strange this would be driven on the street in this form- usually these are trailered to the test track (I've taken photos at that location) by M if they are not in camo. Also a big no-no in Germany to have no front plate! Might be like the pickup truck M3 from several years ago. But seems strange they would go through all that work to make the gaps right and one off a roof and quick release hood if it was for a "Z" model they could just use a MINI clubman for.
Maybe it is a pace car or GT3 base car....
Dunno but obviously BMW wanted us to speculate because these types of shots are more often then not staged (imagine that).
