It's also worth nothing that not all of the 1.5m+ Xbox Ones sold during the December NPD period were XB1S's. I was really surprised that the OG XB1 made up a fifth of those sales. Of course, there is a limited supply of OG XB1's and once they're all gone, Microsoft can't depend of OG XB1 fire sales to boost the numbers... that is not if the XB1S bundles start receiving fire sales too.