This is old news but if you are one of those who would like to preview the next microsoft os here is your link..

Windows 8 Consumer Preview is a prerelease version of Windows 8. It is strongly recommend that only experienced PC users download Windows 8 Consumer Preview. Before you download the preview, you should weigh the pros and cons of installing software that’s still in development. If you install the preview release, you’ll get to try out the many new features, but you might also encounter errors that you wouldn’t encounter using a released version of Windows.

Link to Win 8 CPreview (just putted the US english link but check out for your own national language ms page)