There are far more effective ways to generate hype than to drive a car around with no logos on it! LOL. Do you really think this would sell one more M3? southlight has it right.... looked like a final product to me, now they are testing it on public roads.
I can tell you in my + or - 30 min of following him, no one cared about the car except me. There was one driver in a 335i coupe that looked, but he didn't seem too interested.