That's correct ... Windows 9 doesn't exist and it will never exist. Microsoft decided to skip this number and instead call the new Windows, Windows 10. Why did they choose to skip a version? Mostly because as they see it, this is a new beginning, a threshold for Windows, bringing together a long promised system that will run on a huge variety of devices; from the smallest devices without a screen to phones, tablets, desktop PCs and consoles. Microsoft pointed out that this is not a "single user interface to rule them all" but instead a product family, with a tailored experience for each device.
Full article here.Originally Posted by Microsoft
Sometime today, the company is also launching a new program called the Windows Insider Program, which will allow all of you to download Windows 10 to preview it and share your feedback thus help shaping the new operating system. You can join the program by clicking here. Be advised that this is not a finished product, but instead a pre-beta full of bugs and issues. It is not meant to replace your primary operating system and is meant for people who are comfortable dealing with bugs.
Below the whole introduction to the new OS with a demonstration: