First thing I noticed from the picture in the main post is that it isn't just a PC/tablet OS anymore. It's also on the phone, Xbox and even the Galileo boards of Intel.
They finally fixed up the numeration. From the customer’s perspective, Windows 8 was the ninth NT release. 3.1, 3.5, 3.51, 4, 2000, XP, Vista, 7, 8.