Yeah, try the custom install option when booting from the Windows 8 USB/Disk and format the partition you are going to use then.Try formatting/initializing it with the installer.
I set it up last nite over my 13" MB Pro Win8 CP bootcamp installed from a usb drive and it's up and running. Installed latest bootcamp drivers and 4 updates from windows but then had to sleep. Looked good so far More playing tonite.