I suspect the technology will take at least a few generations to become as good as the greyscale. I think a screen like that could be very useful for tablet PC type devices. But that is way to big for a portable reading device.

I'm concerned that the trend toward do-everything type of readers will diminish the ability to simply read books. I want a good reader, not a swiss-army-knife compromised device that does a lot of things so-so and nothing well.