it would logically come down to something in the firmware needed to support the new faster CPU AND the touch layer in the same box. We take it for granted these days but not too long ago we all hunted for specific BIOS'es to run certain hardware (CPU, mice, etc.). Right now slate computing devices are at about the same maturity level in hitting that point where it is a given that everything will run with everything else hardware and software wise.
I doubt there is any existing standard interface for adding touch panels to a slate device be it an ereader or a slate PC.
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