Microsoft have made the download for Windows 8 Release Preview to available for general public. You may find the working product key for Windows 8 Release Preview (both x86 and x64) and direct (from Microsoft) download (ISO version) links below,
Download Windows 8 Release Preview
32 bit / x86 - 2.5GB ISO
64 bit / x64 – 3.5GB ISO
Product Key for Windows 8 Release Preview
TK8TP-9JN6P-7X7WW-RFFTV-B7QPF
Download other versions (Arabic, Chinese (Simplified), Chinese (Traditional), French, German, Japanese, Korean, Portuguese (Brazil), Russian, Spanish, Swedish, Turkish) from below link,
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