Windows 8 Release Preview available for download

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Windows 8 Release Preview ISO images
http://windows.microsoft.com/en-US/windows-8/iso


Windows 8 Release Preview available for download
http://windows.microsoft.com/en-US/windows-8/release-preview


Windows 8 Release Preview: Frequently asked questions
http://windows.microsoft.com/en-US/windows-8/faq#section_1

 

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Windows8 Release Preview Upgrade Assistant will check your system and software prior to installation.

And give you a chance to review the results and recommendations:

In my case it found 3 items for review of what all 3 were installed programs with compatibility notes.


And it goes on to download the Windows 8 installation for you.