Earlier, I described on my Gizmos Grabowski blog about how to run Windows 8 in a virtual machine; see worldcadaccess.typepad.com/gizmos.
Later that day, I got AutoCAD 2013 (RC beta) running in 8. It works, except that running inside a virtual machine, the graphics are a bit sluggish, because 3D graphics are emulated -- no hardware drivers.
Point is, however, that AutoCAD runs in Windows 8, even if it is not on the official support list. Here's a picture; click it for the unfuzzy view. The large white icons along the right edge are generated by Windows 8, when you move the cursor over the time-date display on the status bar.