Microsoft's Windows Blue operating system update may be on its way to a public, consumer preview in the next few months From All About Microsoft:

More rumors about Microsoft's next Windows release, codenamed Blue, are trickling out from Win8China.com, a site known for leaking information about new Windows releases.
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Though I cannot corroborate all Win8China's specifics, I'd say based on previous Windows Blue tidbits I've heard, the site's latest Blue information seems largely believable.

In August 2012, I blogged about Microsoft's Windows Blue work, noting that a summer 2013 debut was the internal Microsoft delivery target. On February 24, Win8China claimed that the release-to-manufacturing phase for Windows Blue is supposedly June 7, with retail availability planned for August 2013.

 Microsoft's next Windows Blue test build said to be a public preview