The plant in Spartanburg, S.C. currently has the ability to produce both the X5 SUV (sorry, SAV) and the Z4 roadster, but when BMW consolidated the two lines last year, they had every intention of using the plant to produce another Ultimate Driving Machine. Not only that, but they've turned up the wick on hiring, with four job fairs planted in the coming months.
Since the plant is running under its current capacity, the Spartanburg center would seem to be the ideal place for BMW to produce a crossover within the same country where sales will likely be highest.
[Source: Automotive News – Sub. Req.]