I have downloaded and tried to install F12 Alpha using
x86_64 Live CD
x86_64 Install DVD
They all fail during the "Finding Storage Devices" stage shortly after clicking "Install Anyway." Bug #519427 was posted by Bob Agel and added to by me, with no feedback yet.
Bob Agel posted the contents of the error message in that bug report - will not repeat here due to length.
I would really like to get this resolved, as I will not be able to use F12 if this persists. I have previously installed all versions of Fedora on this computer and am sending this from F11.
Any hints would be greatly appreciated.