The anonymous source claims Windows 8.1 Update 3 may be published in April 2015 while Windows 9 should follow in June 2015. Interestingly, the site also claims that Windows 9 will be available for free to anyone who updated to Windows 8.1 Update 3.
Popular Windows leaker WZOR reports that Update 2 will be free to Windows 8.1 Update 1 users, and sold to all other Windows customers at an "affordable price." The same holds true for Windows 9: customers who upgraded to Update 3 will get the new OS for free. That sounds a bit "off," as Microsoft made Windows 7 users pay $40 for the Windows 8 upgrade when it was first released. Then again, we've heard this "free" argument before, as Microsoft supposedly wants everyone on the newest version.