Windows 9 Preview will be released for download later this month, but the very first screenshots showing the upcoming build in action are already here.

As you can see for yourselves by browsing the screenshots in the gallery, the preview build of Windows 9 indeed includes many of the rumored features, among which a notification center and multiple desktops.

German site computerbase.de has published the screenshots earlier today, claiming that they are part of Windows 9 Technical Preview build 9834.

http://www.computerbase.de/2014-09/windows-9-technical-preview-bilder-testversion/