This has to be a supply chain nightmare for someone at Apple. When there was just one iPhone, they just had to worry about populating places with enough of them. Then when there were white and black, they had to keep track of which color was selling faster than the other. Now someone's going to be pulling their hair out... both the supply chain manager and the customer that wanted the one color that the store doesn't have.
I like the color choices though. I think they all play well with each other and on the higher priced phone while the bright colors play well with each other on the lower priced phone. I imagine they will come out of this looking really smart in their recent iPhone decisions.
I think for the champagne and graphite colorway, customers have to apply online - this will let apple/foxconn to anodize those parts based on quantity of the order. That should solve the supply chain issue.
Basically, Apple wants to eat up the lucrative market of http://www.anostyle.com/