Microsoft announces Windows 8 Preview Release
Microsoft announced the release of the much awaited Windows 8 Preview Release Version that will be available in the first week of June 2012, according to a message posted on Twitter by the company founded by Bill Gates. It is expected that the final version Windows 8 will be released in October, and a RTM version(release to manufacturing) to be available in August this year.
Windows 7 had a similar timetable back in 2009. Windows 8 will be available in three versions: Windows 8, Windows 8 PRO and Windows Pro RT.
Until the Preview Release version, you can be downloaded for free Windows 8 Consumer Preview ISO format.