With Windows 8, Microsoft changes the Name of the “Windows Automated Installation Kit”, well known as WAIK, to “Windows Assessment and Deployment Kit”, which is shortened by Microsoft as ADK. For me the most interesting Tool is the Windows System Image Manager, which comes in Version 6.2.8250.0 and supports Windows 8.

With that tool, I could made a new unattend file for Windows 8, and the SCCM OSD works.

You can get the Windows 8 Consumer Preview ADK here:
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=28997

/Update:
And now the Windows Assessment and Deployment Kit (ADK) for Windows 8 Release Preview:

http://msdn.microsoft.com/en-us/library/windows/hardware/br259106.aspx