Windows 9 release date - 23-09-2014

With Windows 8 and now Windows 8.1, Microsoft tried – not entirely successfully – to make tablets part of a continuum that goes from number-crunching workstations and high-end gaming rigs through all-in-one touchscreen media systems and thin-and light notebooks down to slender touch tablets.
The general consensus is that it still has a long way to go to produce a unified OS.
Despite rumors of an aggressive development and shipping schedule, there's no official word about what's in the next version of Windows, but there are plenty of rumors (many of them from Chinese enthusiast sites that claim to have leaked builds), plus more reliable information from job postings for the Windows and Windows Phone teams.