Windows 8 mostly waited by windows user, some features that exist for this Windows 8 Developer Preview: Optimize for touch screen, support ARM Chip, Windows Store Application, support NFC (Near Field Communications), Fast Booting, Internet Explorer 10, Better Security, No need to upgrade your computer.
Windows 8 Developer Preview provides an early look at the next generation of Windows, complete with touch interface, brand new desktop apps, and more. once it´s launched you´ll find the new Metro-style desktop (if you´ve ever used or seen Windows Phone 7 then you´ll know exactly what to expect) comes packed with extras. So as well as links to Explorer, Control Panel, IE and the old-style desktop (which is still available, if you get lost) there´s a weather app, social networking tools, games, productivity apps and a whole lot more.
The Windows Developer Preview is a pre-beta version of Windows 8 for developers. These downloads include prerelease software that may change without notice. The software is provided as is, and you bear the risk of using it. It may not be stable, operate correctly or work the way the final version of the software will. It should not be used in a production environment.
The features and functionality in the prerelease software may not appear in the final version. Some product features and functionality may require advanced or additional hardware, or installation of other software.