Windows 10 will be released in mid 2015. There will be no version 9. As the competition for the consumer devices (Phones, Tablets, TV's etc) has been won by Android and Apple, Microsoft is turning to the business sector for future sales. This means the old start menu has to be returned which will require less training. A partial Tile system is still there but the Charm Menu is completely removed. It appears Microsoft is looking to a yearly subscription with incremental updates instead of full upgrades. This could be why it is called Windows 10 (or 1.0) to signify a new way of operating. Software applications will be bought from the Online Store.