They have the developer preview available - you can burn the ISO to a DVD and set it up on a old computer or run it on the latest version of VMWare Workstation as a virtual machine if you have a good desktop. http://msdn.microsoft.com/en-us/windows/apps
I've tried it out and the Apps & Games they have are very basic. People are using Visual Studio 11 Express for Windows Developer Preview to build them right now.
It would be nice to see an export feature from CS2 to Visual Studio so the games could be packaged there.
Here are some sample apps if you are interested: http://code.msdn.microsoft.com/windowsapps/Windows-Developer-Preview-6b53adbb
*Requires: Windows Developer Preview OS
Windows 8 is pretty clunky right now since its really designed for a multi-touch screen. You'll see a ton of touch screen monitor come out when its released.
If anyone needs any help setting it up just let me know.