Sorry to dig up an old thread, but thought I'd tag on here vs starting a new one.
We're looking for a X3d as well, and it's still no-go. I checked the BMW "build your own" site and the diesel is no longer shown. The dealer is unable to get any info. Makes me think that it's done. Has anyone else heard differently?
Unfortunately our 328d lease expires soon (great car by the way) so it looks like we'll get another sedan.