A spokes person from Microsoft Indonesia had a little slip of the tongue and said that Windows 8 users can upgrade to Windows 9 for free. Two rumors are now debunked, yes Microsoft will be announcing Windows 9 and yes you get to have a free upgrade.
Once Windows 9 is released all the end-users needs to do is to hit windows update, after which Windows 9 will be installed automatically. Microsoft is holding a secret event on September the 30th and it is expected that that they will launch the successor of Windows 8 that was developed under codename Threshold.
From leaked screenshots it is apparent that Microsoft will introduce a new start menu with live tile integration, Modern UI apps with windows display and notification system. Microsoft will also inject the digital assistant Cortana into Windows 9.