It features a new touch perceptive Metro user interface, runs on Intel x86 chips as well as ARM processors (work on tablets, laptops and desktops), and run anything that runs on Windows 7. Besides, Windows 8 will be able to run on a wide variety of machines including tablets, because it will have the same or lower system requirements that Windows 7 needs. [More detail available here] Users can now download and tryout the Developer Preview at Windows Dev Center. The download includes a 64-bit (x64) build with development tools to build apps, and a 32-bit (x86) or 64-bit (x64) build without development tools. (Via)
