So called “trusted” Russian leaker, WZOR, has said that Microsoft has an internal document that Windows 8 is to be released January 7th, 2013 with betas released before then. I’d definitely take this with a grain of salt, as the “trusted” source has been wrong before.
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Windows 7 and Server 2008 Service Pack 2 has been worked on since the fall of 2010, and is expected to touch down if all goes well sometime in mid-2012.
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In March, Windows 8 M3 development will commence.
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Following M3, work on the first Windows 8 beta will begin; according to WZOR, Microsoft will release two public beta milestone builds in Windows 8′s development.
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After the second beta, the RC will be worked on then released.
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Approximately three months after the RC, Windows 8 will reach RTM.
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And of course, following RTM, it will hit the store shelves and reach the general availability (GA) phase of development, which WZOR states will happen on Monday, January 7th, 2013.