https://www.mobileread.com/forums/showthread.php?t=86942
the epaper layer is still eink. They showed the Color display at SID. I spoke with the eink engineer that worked with the display just before the show- he was very impressed with their color. everyone I talked to was impressed with it. I was too but it was good to hear the people involved express it themselves.
they are going into production with color in the 4th quarter.