I don't think the steering wheel itself is different, because it would be too complicated for Bmw to maintain 2 versions of each model (base, sport, M which I ll have) , I think it is just "disabled" but hardware is here. I ll check on Bmw etk though.
Edit: I checked on etk and yes you re right the steering wheel has different part number, + there is an additional "HOD" electronic device in it. Would be curious to know what would happen if we retrofit theses components and reactivate the functionality in the car ^^
Anyway I can deal without this functionality in traffic jam, because we need to keep both hands on the steering wheel which means I cannot play with my iPhone or go on this forum while stuck in traffic jam