You've seen it via still imagery; now check out the upcoming BMW M3 cruising down the highway.
Spy shots and the Concept M4 Coupe unveiled last month have already provided an excellent idea of what the M variants of the new 3 and 4 Series will look like. While there's nothing particular eye-opening about this spy video of a new BMW M3 sedan cruising down the highway, it does give us the first chance to see it in motion. Too much wind noise means there's no sound on the video. Hearing the new turbocharged 3.2-liter straight-six engine will unfortunately have to wait for another day.
The Detroit Auto Show in January is where the new BMW M3 and M4 will be formally introduced, so hopefully that day will come before then.