Here's some video from the show in May where it was demoed (the 300dpi display is shown in the last segment, from 2:17:
http://www.youtube.com/watch?v=UpazF6ptq4o
The display shown is static unfortunately, and we don't get any idea of the display's speed, though he says it doesn't have the 'flash' (which may just mean they're using partial refresh).
If they can sell this display for a reasonable price I'd be very interested.