Back in 2013, Samsung sold LiquaVista, its electrowetting display unit, to Amazon (Samsung itself bought Liquavista in 2011). Electrowetting enables low-power non-volatile color e-paper displays, but the technology has not been commercialized yet.
According to Good-E-Reader, Amazon is now developing an 8" color e-reader that uses an electrowetting display, and it plans to release this new e-reader towards the end of 2016. Amazon will produce these new displays in China - at the Beijing Century Joyo Information Technology's fab in Shenzhen. This is of course not confirmed yet or anything, it'll be interesting to see if Amazon is indeed so far advanced with its Electrowetting tech.