If the information we have right now is accurate, Windows 9 should see daylight in April 2015, approximately one year after the introduction of Windows 8.1 Update.
While this does make sense when taking Microsoft’s new fast cadence into consideration, it’s really a weird decision for PC manufacturers, who are upset that it takes so long to bring a new operating system to the market.
Russian leaker WZor says that some OEMs have expressed their complaints towards the April 2015 release date, explaining that during that time of the year sales are going very slow. At the same time, they are asking Microsoft to bring the OS version to the market sooner, possibly before Christmas and the New Year, in order to benefit from the holiday sales boost and ship more devices.