Winbeta reports that a source named WZOR, which has provided a number of Microsoft information leaks in the past, claims that the company is planning to merge Windows Phone OS and Windows RT. The source doesn't provide additional details, but rather states that this has been mentioned several times in the past. True or not, Microsoft is seemingly already paving the way by providing support for 7 inch form factors in Windows RT 8.1 launching this October.
In addition to the possible merger, the source also leaked a bit of info regarding Windows 9 and Windows 10. The good news is that Windows 9 will reportedly be similar to the current platform much like Windows Vista stepped up to Windows 7. The OS will also supposedly reintroduce the old Aero interface, but it won't be quite the same. Windows 9 will even reportedly launch in a year's time.