With September 23 just around the corner, BMW has released another set of smoky teasers aimed at revealing some of the key features of the upcoming BMW M3 and M4. While the G20 3 Series was a good car in its own right, for enthusiasts, much of the focus has been on the rather fantastic M340i model and was essentially the closest thing to an M3 at the time. Heck, it’s only been relatively recently when BMW finally said that an M3 and M4 were coming, including an awesome touring (station wagon) version.