It's just PR. Sold out of how many tho? Weren't the displays from Sharp delayed thereby causing the inventory to be smaller? The plot thickens.
That and the fact that it's incredibly easy to upgrade free from an equal or almost equal resell of last year's model. So the real questions are: 1. How many are "new" sales/activations? and 2. How many sold their old phones? There are quite a few variables to consider here than just a flat sell out number.