Windows 8 Preview Release

The Upcoming Windows 8 for PC and Mobile

In action. See video below

Upgrading

Can I upgrade from previous versions of Windows to Windows 8 Release Preview?

Yes, you can upgrade to Windows 8 Release Preview from Windows 8 Consumer Preview, Windows Developer Preview, Windows 7, Windows Vista, or Windows XP, but you might not be able to keep all of your files, programs, and settings. The following table shows what you can keep during an upgrade depending on the current version of Windows running on your PC:

Current operating system	What you can keep
Windows 8 Consumer Preview	Nothing (your files will be saved in the Windows.old folder)
Windows Developer Preview	Nothing (your files will be saved in the Windows.old folder)
Windows 7	Programs Windows settings User accounts and files
Windows Vista	Windows settings User accounts and files
Windows XP	User accounts and files