A recently leaked screenshot confirms a new feature "History Vault" found in Windows 8 build. Following is a screenshot of this feature in action:

History vault is a similar to Time Machine which is a feature present in Apple's Mac OS. History Vault allows you to backup your important files to another drive.
Its also said that Windows 8 will support videos as User account picture:
Also the titlebar buttons are a bit bigger than Windows Vista, 7.
This article was posted by VG in following section: Windows 8.
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Spice
Good feature. thnx.