It seems that after a very criticized Windows 8, Microsoft is upgrading it to the version 9, despite the Windows 8.1 is good .
The new version Windows 9 will arrive at the end of September. It supposed to work much better on non-touch devices and should bring a new mini start menu , kill the charms bar and bring up Cortana the command voice system on Windows phones to Windows 9.
The formal version of Windows 9 will be reveal in Spring 2015. The information thanks to CNET Video: