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It is just a speculation but I would expect to see new models from Sony with the next generation e-ink in September.
My speculation is based on the following tidbits of public / semi public information:
1) according to Bloomberg, engadget, there is a rumor of Amazon coming out with the new Kindle this August, which would have the display from the new e-ink generation.
2) according to a small ebook reader producer, only Amazon and Sony get access to displays with the new e-ink generation for 3-6 months after its availability.
3) September is the time when Sony releases new devices.