While I know it is experimental I was hoping their might be more documentation on Intel's implementation of the device fusion extension to OpenCL. The OpenCL specification for this extension is so minimalistic for a subject which is this complex. If possible it would be nice to have some information on how devices share memory, how the hardware is divided on typical systems, known issues, and potential problems which may arrise. I know you are trying hard to get user feedback on this subject but it is hard to effectively test knowing so little about how the implementation maps to hardware.
If this exists I appoligize for not finding it. The only information I could find was the couple of paragraphs in the user's guide.