No it is not possible. Amazon is not using color eink, which is just regular screen with color filter array added. They are not adding expense, complexity, and weight to a product and not use the feature.
Unless you think they are going to release a firmware and turn on colors and yell surprise! We gave you a color display. Yay!
It's most probably a flaw with the light diffuser. Their lighting system must have a low fault tolerance which is why we're seeing many problem units.