The 6er obsessives at 6post noticed this advertisement from the Dutch newspaper NRC Handelsblad, which appears to show the new BMW 6-series with the expected M-Sport visual tweaks, including the "not-quite-M" U-shaped intake.
As they point out, a wide U lets you know the car is an M-sport while the inverted U is reserved for full-on M vehicles like the new 1M Coupe. A cross with a bowling ball in the upper right side means "Doctor here won't charge" and a top hat means "kind gentleman lives here."