This is a detailed preview of the next major release of Windows, code-named "Windows 8". From the chipset to the user experience, Windows 8 brings a new range of capabilities without compromise.
Windows 8 is designed to be the first Windows client to support systems on a chip (SoC) architectures, including ARM, and since it will be pre-installed on a range of next generation devices, it will also feature Metro, a NUI + GUI interface on the surface combined with a new application platform under-the-hood designed to enable the creation of immersive experiences.
The latest iteration of Microsoft's operating system brings an innovative new platform and tools to developers. Windows 8 apps can use a broad set of new libraries and controls, designed for fluid interaction and seamless connectivity. Apps can add new capabilities to Windows and to other apps, connecting with one another through the new interface.
IMPORTANT INSTALLATION NOTES:

The product keys for using the Consumer Preview are available on this page.
Windows 8 Consumer Preview Setup will check to see if your PC can run Windows 8 Consumer Preview and select the right download. Setup also features a compatibility report and upgrade assistance. Built-in tools for creating an ISO or bootable flash drive are available for some previous versions of Windows (excluding Windows XP and earlier).

If you would prefer not to use Windows 8 Consumer Preview Setup, you can download Windows 8 Consumer Preview in ISO format instead.
The easiest way to convert an ISO file to a DVD in Windows 7 is to use Windows Disc Image Burner. On a PC running Windows XP or Windows Vista, a third-party program is required to convert an ISO file into installable media - and DVD burning software often includes this capability. One option is the USB/DVD download tool provided by the Microsoft Store. You can also download Windows 8 Consumer Preview Setup, which includes tools that allow you to create a DVD or USB flash drive from an ISO file (Windows Vista or Windows 7 required).

Limitations:
· Expires on 15 January 2013