the concept versions had page turn buttons on either side ogf the e-ink
strange that the dropped them. maybe because of balance they were awkward to use?
what might be nice is if you could just turn off the lcd but leave on the touch layer for page turning or "scrolling" thru a pdf.
I think the awkwardness of the design comes from the differences in bezel sizes around buttons and screen as well as that button placement.
Next Gen design should use a sort of fake edge to edge design. Car companies hide pillars(bezels) by wrapping glass over them and that work well here. You could also use an lcd screen that was the same width as the e-ink. once covered by the edge to edge glass it would give the illusion of one big display instead of 2 separated by all of that bezel.
the buttons could also be replaced with touch spots like on the newer smartphones.
hmm if i had inkscape on this laptop i could probably illustrate what i mean..