As you might already know, Windows 8 has recently been leaked, in the M1 build, which means nothing for the average user, but a lot to hackers. Those who have messed with the fresh code, found some interesting features in the new OS, like the ability to log in through facial recognition.
As you can see right here, the OS is able to detect human presence, meaning that it may use a Kindle-like system to detect that the rightful user is present. This would mean that Kindle gaming will also be available on the PC, not only the console and we can also imagine tablets with this system on.
Last we heard, Microsoft was developing Win 8 specifically for tablets, since Win 7 is not at all fit to compete with the likes of iOS 4.3 and Honeycomb. Imagine a tablet with Windows 8 and Kindle gaming on the go.