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As iReaderReview said...many, possibly most, of the newer e-paper technologies are piggybacking on LCD technology and manufacturing processes, and actually being involved in e-paper development will require quite a bit of knowledge about the current market.
As far as Pixel Qi is concerned...I doubt they're going to go that route. Though there's a chance they'll try to pick up Mirasol or Liquavista, it's also uncertain at this time. It's not about how good or interesting or useful the technology is...it's a question of what they can sell.
The question right now that should be addressed regarding screen technology is: Do they bifurcate the Kindle market into two distinct market branches, keeping EPD on one hand and adopting a colorful emissive display on the other? Or do they maintain a singular device platform? The former creates problems with pricing disparities, and the latter requires careful consideration of technology and marketing. Maintaining an EPD-only product line will likely hurt Amazon. Moving to Mirasol creates problems since it apparently can't do grayscale very well, but is highly marketable. Transflective LCD like Pixel Qi both yields technological drawbacks and might not make for a happy customer migration.
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