Actually, I was at my "local" BMW dealership this weekend and had a chance to see carbon leather trim in real life. It is not unique to the upcoming M3, but rather available right now on the M coupe.
The hard top version of the M coupe I saw had black leather interior with black carbon leather, and I was very impressed by the trim. I had thought I would prefer the shiny carbon fiber of the M6 over this leather pattern, but in real life the matte finish of the leather blends in seamlessly with the interior.
Unless the wood trim looks beautiful, I am planning on ordering my alpine white E92 with bamboo beige and carbon leather trim now that I've seen it in person.
Now:'05 G35 6MT\Laser Red\Beige\Sport\Premium
06/2008: M3, 335+Dinan, or ...