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If I recall... well, not "correctly," but "vaguely correctly"... the butterfly wing was the source of the idea of using light waves that interfere with each other to produce specific colors. But I think in the original description they talked about changing surface angles within the display to change colors. That made me wonder if the colors would look the same from all angles. I guess if it's wavelength interference creating the color, the viewing angle might not matter. But if they have to manipulate a reflecting surface to change the interference pattern, I hope whatever they're using has a fast response time. I love e ink, but the response time is kind of annoying sometimes.
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