From the video it looks like they haven't completely solved the ghosting problem which occurs when the screen is updated without going through a full-refresh cy

From the video it looks like they haven't completely solved the ghosting problem which occurs when the screen is updated without going through a full-refresh cycle. They seem to be trying to hide it too, given how they cut away so quickly from moving content on the screen... That said, E-Ink displays are cool, and this still appears to be a huge advancement.