So happy to hear that I am not the only one with this problem. There is a loud squeeking noise coming from under my drivers seat. It occurs when going over bumps and even just during normal driving. It is very loud and very annoying. It happened for the first couple of weeks, then I guess I moved the seat around a little and then it went away. It happens intermitently now. I spoke to my SA about it a couple of weeks ago, and he could not replicate the sound and neither could I at that time. Then last week it started again and I was close to the dealership, so I took it by. He said that he had someone else in an M6 in for the same problem at that time. He told me he would call me once he had the problem figured out and then have me bring mine in.
I will update when I know more.