I'm kind of surprised that this hasn't really been mentioned before but it's obvious there is no sunroof option like in the MS. The glass roof is too big and has no side rails like the MS for opening. This is kind of unique in a sedan as almost every sedan that I can think of has a sunroof option. Before people start screaming and cancelling your reservation, ask yourselves how much you really use your sunroof in your past cars. Most people are like me and open it maybe a few times a year. They are known to be sources of leaks and wind noise and mechanical problems. Plus, I must point out that the MX also doesn't have a sunroof option because of the Falcon Wing Doors. It's just not possible to have the panoramic windshield and the FWD and put in a sunroof. For those worried about having constant glass overhead, the special zinc coating on the glass reflects harsh light and UV and most of the heat so it hasn't been a problem in the MS or MX so should not be a problem for the M3.