Neowin.net posted a news story that elements of the Metro UI for Windows 8 have also now surfaced on the Internet

The image, courtesy of mswin.me, shows the back, forward, close, minimize, expand, help, and several other images that Microsoft will incorporate into, most likely, the 'Aero Lite' theme that Neowin reported yesterday. This image helps to confirm that Microsoft will be using the Metro design language in Windows 8 in at least one theme, if not more.

  Windows 8 Aero Lite button elements revealed