I would have to imagine that the picture in the KS update posting was a debug version of the shield, and they made some refinements before making the final batch of shields. Given the first one is purple, I suspect it came from OSH park, which is a quick turn around pcb maker that you can order smaller lots (multiples of 3). The final version was probably made by the people who normally make the pcb's for digistump, and presumably make shields in much higher volume/lower cost per pcb.