I had the the tin can noise as well (February Build). This was the same day, just after I had some sort of shims replaced on my front wheel area (between rotor and hub - it was hitting the brake shields).
Now, what is funny is I heard "the new noise" coming from the rear and knew it was what the F80/82/83 crowd heard as rocks getting stuck in the brake shield.
The video directly below was my first issue with a noise, which sounds nothing like the other two videos and was corrected after those shims were replaced (apparently there is a service bulletin out on this issue as well):
This is what I heard from the rear or otherwise known as "Rock in brake shield" M3/M4 Videos below: