2011 Z4 was to introduce the "is" model. Can't have one model of Z be a 2011 and the others be a 2010. Typically most manufacturer's bring out the new model year in late October or early November. Exceptions seem to be for new releases and trying to beat the competition to the punch. Bottom line it is $$ driven.
My company is a tiered supply to several auto manufacturer's and we are currently providing parts for vehicles that will be released in 2015. We know where and how our parts are used but no idea what vehicles they will be on.
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