Frankly, after nearly 4 years on the reservation list and being disappointed time after time, by being deferred, Yes, i would indeed expect more than just a car a week or so before general production, and possibly a cap or T shirt. The sig colours are nice, but I was looking at Brown with Tan as a serious alternative. We are talking about a paint colour and a leather colour here. Whether an in house manufacturer cuts up a tan hide or a white hide.... doesn't really make a huge difference in the great scheme of things. And since they are working on a just in time principle, and don't really have much in the way of inventory, what the heck, we are getting our cars here when the new model is being delivered in the States. As evidence for this they started with black only for the new seats, but within two weeks were already offering a full range of colours as before. Different frame and cutting/sewing pattern.
As to changing the colour on the sprayers, i don't know enough about the technology to comment, but i would be very surprised if it was as big a deal as say using my spray gun at home and having to thoroughly clean it before being able to spray a different colour. It would be, i am sure, an automated process. They could even have a store of sig red bodies left over from the European launch and don't even have to paint that colour again. The factory is certainly big enough to have had them in undercover storage without interfering in day to day running. They are only using about 20% of the available undercover floor space from what i could see following my visit there in 2011.