I thought I'd just throw this in...
I noticed I had a vin (1884) the first week of March. I reserved my P90D 4/15 and confirmed 1/6/16. Ordered it with every creature comfort offered and onyx wheels. A week before that vin showed up I had spoken to my DS and asked about the delay of the black wheels. He confirmed that the wheels were a delay and if I had chosen silver I would have most likely had my car by the end of March. I was supposed to hear back from him about the possibility of changing them and what effect it would have on delivery date when the vin showed up. I still haven't heard back from him yet.
On a side note, there have been two P90Ds delivered in the last two months within a few blocks of my house. One of them is directly across the street/corner (we're in a cul-de-sac) from me that other than having silver wheels and white seats, looks like what I ordered. It is what I ordered. We see each other all of the time, go to the same functions/parties, have kids (me 3, her 4) the within the same age ranges, and so on. We never talk cars though, we talk kids, houses/renovations and the neighborhood. Needless to say, I've been in hers, I love it and I'm very happy with what I've ordered. The other X is around the corner about 2ish blocks from us but we don't know them. It's a red one. Ours are both blue and will basically pull in to park opposite each other. And we are usually coming and going at about the same time. Pretty crazy...