Interesting. We just picked up our x3 28 2 days ago and our grill is flat black. Looks great. Also took a factory tour and all 28i I saw in the line had black grilles.
2013 X3 28i, AW, Chestnut, Sienna, ZAP, ZCV, ZCW, ZDH, ZPP, DHP, rear view, park distance, cargo net (Wife's)
2010 Porsche Boxster S (Mine)