Windows 8.1 to be made available in October | The Verge

Almost re-Start time

"Microsoft is currently testing near-final versions of Windows 8.1, but the company won't release the final update publicly until October. According to sources familiar with Microsoft's plans, the software maker will finalize, or Release to Manufacturing (RTM), Windows 8.1, but the update will not be pushed out to existing machines until October. Partners and PC makers will receive the final bits later this month, and the gap until an October release will allow them to finalize their own testing and drivers for the roll out."

Windows 8.1 to be made available in October | The Verge