Because it follows the interpretation of the M3 Lightweight Sedan (which is coming next Week) allbeit with a few more changes it is still in the early stages of prototypes and decisions, It wont come out till about mid- 2012. So there is a long way to go.
But if you take into consideration the number of units , production timeframe etc , the transition to federalisation and so on...
It might not be cost effective for BMW to offer the car in the US .
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