I saw a pair of brand new OEM M3 convertibles in my local dealer with this matte finish, one in Grey and one in Black. There is one catch anyone choosing needs to be aware of, which hadn't occurred to me but is kinda obvious when you think about it. Under no circumstances are you allowed to apply any kind of polish as it makes the finish go shiny which ruins the paint job! And yes, it is a matte clear coat.

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Me:
Current: 2011 E71 40D Vermilion Red/Beige Nappa

Wifey:
Current: 2012 R80 Countryman SDX Green/Cream