The display would be able to switch between all eink, all lcd or even just regional updates for either so that static content could use the eink display and only a portion- video presumably- would be using the lcd
the picture above baffles me. the lcd layer and eink layer should be swapped in my mind. with a transparent lcd on top of the eink. I dont see how they envision it working with the eink above the lcd.
from
http://www.appleinsider.com/articles...t_regions.html via
http://www.crunchgear.com/2011/04/07...de-ink-iphone/