Windows 8 Preview download and steps on how to install the bits from ISO file.

Windows 8 Preview download here on MSDN -
http://msdn.microsoft.com/en-us/windows/apps/br229516


How do I install the Windows Developer Preview from a disk image file?
http://social.msdn.microsoft.com/Forums/en-US/windowsdeveloperpreviewgeneral/thread/ee1551b7-2508-413e-a1ff-cf00a97b80a5