That would be quite an accomplishment if they can manage to pull that one off. the "pixels" in E-ink displays are composed of polarized microscopic spheres (black on one side and white on the other) that rotate under the influence of a magnetic field.
To make a colour e-ink display would require a panel with alternating red-green-blue spheres, or CYMK spheres since E-ink is more akin to printed material than projected light material. But you can't overlay the spheres, and putting them side by side could cut the effective resolution of the display down to a quarter of its resolution if the "pixels" themselves can't be shrunken down.
This doesn't mean they can't do it. But I'll definitely want to see the results before considering purchasing one. New technology isn't always at its best when initially launched.