The next iteration of Windows, known as Windows 8 on PC, will be released on October 26, 2012. It will be available as both a downloadable install or on new PCs after that date, according to Microsoft’s Steven Sinofsky.
For current Windows users in most markets, the upgrade price will be $39.99 until January of 2013.
If you want to start playing around with Windows 8 and getting used to it, the release preview of Windows 8 is still available through Microsoft.