I (and many others on here) sat in the new X3 at the BMW Championship (golf tournament) in Chicago in Sept so this is definitely not the first US appearance. Sounds like the first dealer appearances.
http://x3.xbimmers.com/forums/showthread.php?t=432802
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2009 E90 M3 - Silverstone/Fox Red - M-DCT, CW, PP, TP, 19", Moonroof, Sunshades, PDC, Enhanced Prem Sound, HD Radio, Sat, iPod, Smartphone Integration