This is only the initial startoff for PCIe 3.0. It will still take a few years for hardware manufacturers to work things out and come out with the new product lines to be seen.
As far as W8 even having a 128bit version that remains to be seen when the time comes. The 128bit referred to in the article is for programmers and support to be worked out with existing versions of Windows as far as updates for Windows and driver
support for video cards.
I can imagine some gamers will be looking forward to the double bandwidth over 2.0 to be seen.