Rumor: Windows 9 release date is November 2014

As it stands now, Windows Blue does not seem to be Windows 9, and while none of this has been confirmed officially, it appears as if we are going to see a release of Windows Blue this year. It is interesting to note that Microsoft is keeping the tight-lipped approach about future products after the departure of Steve Sinofsky.
The rumours say Windows blue will be finished in July or August 2013; that's a year after the RTM (release to manufacturing) of Windows 8. We don't know if it will be available to users straight away through Windows Update or if PC makers will get time to test and integrate updates for their systems (the RTM version could go on MSDN (Microsoft's Developer Network Platforms site) in July, giving hardware partners a month to test before release in August). 

According to a post on Soft-forum Windows 9 is rumored to arrive in November 2014, while the first beta is in the works and should land on January 7.
Today news about Windows 9 were posted on Soft-forum that suggest the following timeline for the operating system:

1-7 January 2014 Windows 9 Beta
2-July 2014 Windows 9 Release Candidate
3-October 2014 Windows 9 RTM
4-November 2014: Windows 9 Release