I installed Windows 8 Professional on my Dell Duo and everything worked accept the screen rotation. After many searches and false leads I finally found a solution that worked. Samsung has a support page for their Series 7 slate with 32 bit and 64 bit rotation drivers. I installed the 32 drivers on my DUO and like magic the rotation was back. I also included a link for the 64 bit driver in case anyone needed it.
Rotation Drivers