I ordered mine on 4/Sep/12 and was told two days later that production would start the following Monday (10/Sep/12). I called up on the Monday asking to make a change (since Piano Black trim had been added on the website as an option for the Luxury Line) and was told I was too late and the car had already gone in to production.
I've already got my VIN from the dealer though it doesn't show up yet on bmwvin.com or on the shipping sites. I'm hoping I was lucky enough to get the car done during the September run, but I'm prepared for the worst. The dealer is still giving me an ETA of 22/Dec/12.
2016 F15 X5 XDrive30d M Sport
2012 F30 320d Luxury