With tablets being cheaper and offering better color and decent battery life, color-E-ink is a dead duck.
But don't tell Onyx that; they just showed off a new educational ereader at the Frankfurt Book Fair. Johannes Haupt got up close and personal with the Onyx Youngy Boox, an ereader equipped with a 10.7" color Carta E-ink screen.
Sporting a resolution of around 150 ppi, this device has a camera of unknown resolution, a stylus, and what looks like an electromagnetic touchscreen (I don't think we see them using their fingers). It runs academic software and is only available in China.
That is a shame, because this would be a great device to see.
FYI: The reason this device has a screen resolution of 150ppi has to do with how it gets its color. This is actually a 300 ppi grayscale Carta E-ink screen with an RGBC filter applied on top. The filter adds red, green, or blue on top of a pixel on the E-ink screen (the C is for "clear"). The filter requires 4 pixels on the grayscale screen underneath to give you a single pixel on top This reduces the resolution to 150 ppi.