Microsoft released their newest Windows version today: Windows 8 Consumer Preview.
Windows 8 not only support traditional CPUs: intel and AMD, but also support ARM.
Currently, Windows 8 Consumer Preview version can run both of desktops, desktops, and tablets.
However, Microsoft only provided the versions for desktop and desktop computers.
The download page:
http://windows.microsoft.com/en-GB/windows-8/download (Automatically choose package due to your computer) and http://windows.microsoft.com/en-GB/windows-8/iso (separate ISO files)