The Consumer Preview version of Windows 8 was released last week. This supersedes the Windows 8 developer preview and has some changes, importantly this promises to be a lot closer to the the final release version.
ISO images - direct from Microsoft
64-bit (x64) Download (3.3 GB)
32-bit (x86) Download (2.5 GB)
Product Key: DNJXJ-7XBW8-2378T-X22TX-BKG7J
You can use the Windows 7 USB DVD Download Tool to create a USB install drive.
All info here if from - http://windows.microsoft.com/en-US/windows-8/iso