After importing the Windows 8 CP sources to the MDT 2012 RC1 Deployment Share, and making a Task Sequence with the new OS image, I knew my Windows 8 experience was delayed because of this error;
Windows cannot read the <ProductKey> setting from the unattend answer file.
Other sources say to remove the floppy drive from the VM, but this didn’t solved the ProductKey issue for me:
The solution was rather simple, I had to change SkipProductKey to NO in customsettings.ini.
After changing SkipProductKey=0, the Deployment Wizard asks for the Windows 8 Consumer Preview product key, and the deployment will proceed like it should.