http://www.m3post.com/forums/showthread.php?t=12987
If you look at the pictures on that link, it clear that there is no sunroof!
To me that says definite weight reduction, and or a painted Carbon Fiber roof. The sunroof of most cars is 40-50 of extra weight. NO need for it, if you really want to enjoy the sun/moon that much, get a convertible.
Anyway, what are your guys' thoughts on this.