News coming from Windows rumor is the latest zhenwen, Microsoft plans to release the Windows9 "threshold" Preview on February 3, 2015. There is no indication that this is a developer preview release or public, but since Windows 9 will commence in April 2015, choose the latter possibility seems to be larger.
Windows8, Microsoft BUILD2011 activities launched during the developer preview release in September 2011. The company subsequently announced the Windows8 consumer preview release at the end of February 2012, Windows 8 RTM in August 2012 and hit the consumer PC in October 2012. Not published until June 23, 2013 Windows8.1 open beta, and was released in October. Windows8.1 update (8.1.1) arrived in April 2014.
Use this version of the timetable as reference, Microsoft is expected to launch Windows8.1 update 2 (window 8.1.2) this fall, brings many new features, such as the revised (and beloved), start menu, and the ability to run Windows applications on the desktop. It may also be time periods, when Microsoft released the developer preview version of Windows 9 "threshold".
Latest disclosure from these Windows leak, who posted the screenshot (check the screenshot above) in My Digital Life forums, which are internal documents from Microsoft, we recommend Windows9, preview will be released sometime around 2015 from February to March, and a note on the image that says, "Windows 9 Windows preview version of 2015-02-03. ”