Just came across this tidbit that says there's a new e-ink coming out later this year.
"E Ink's next-generation technology will offer 12:1 contrast ratios (up from 7:1) and refresh rates fast enough to carry basic animations (up from 0.74 second), visible in sunlight.
The screens will ship to partners by Q4, with products arriving next year. "
Sounds promising.
EDIT - Link on that page leads to original article
HERE.