Few hours before (9. AM 13 SEP, Pacific Time) Microsoft announced Windows 8 and they showed the Preview in their keynote. They also promised that Developer Preview is available to all and not just developers.
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The Developer preview is available in 64 Bit with and without developer tools and also in 32 Bit version, Windows 8 mostly works on any PC which supports Windows 7. Windows 8 system requirements are almost same as windows 7. All you need minimum 1GHz Processor, 1 GB of RAM, 16 GB of free hard drive space and a DirectX 9 graphics card with WDDM 1.0 or higher driver.
Here is the download links (Official)
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