From the press release, it seems that the CF splitters and spoiler are not part of the Competition Package but are available a la carte thru BMW accessories. I am actually digging them, particularly the spoiler. I will have to see how the Sedan version looks like but I could see those in my future.
As for the Stop/Start function, I doubt the US M3's will have that feature. Stop/Start has been available on a bunch of BMW models in other markets for a while now and these markets are used to it, consequently more inclined to accept it on the M3.
I cannot imagine that BMW USA would decide to introduce this new-to-Americans technology on the M3. Just like other markets have brake regenerations on the M3 and we don't...
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