Stefan Mileschin

Windows 8.1 isn't officially out yet and we are already worried about what is coming next? My money is on Windows 9. Right now — and this may change — the idea is to deliver a "major" release of "Windows" in the Spring of 2015. My aforementioned source says this major release will be a kind of hybrid that will bring the current Windows and Windows Phone OSes closer together. This is most likely when the rumored unified Windows and Windows Phone Store will debut. (There could be a unified developer portal, allowing developers to submit apps for both platforms before the actual store materializes, I'm hearing.)

http://www.hardocp.com/news/2013/10/..._windows_8163/