New color eInk with high refresh rate and low power consumption.

[sparkchaser]

Still a few years away from fulls cale commercial use though.

Gamma Dynamics high-contrast, high-speed electrofluidic e-paper gets closer to reality -- Engadget

 

[morgani]

My first question would have been how much! But yeah, I think the time frame for color e-ink readers would be around 2013-2015. But this is the time frame I've read about at the time the first Kindle was released.