The Windows 7 release date durations IMO mean very little for Windows 8. All of the really hard work for Windows 7 was done with Windows Vista.
Windows 8 will not only require major changes to Windows including supporting two platforms, Intel and ARM, but also to it's flagship apps such as Microsoft Office, Project and Visio. Assuming that these apps will run on multi-touch tablets and are released concurrently with Window 8.
GA - early 2013 (let's say 1/18/2013)
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