Россия...

Yes, I heard about it, but would be skeptical at this point. The review you linked says so in its conclusion:
Quote:
Having an e-ink display on the back of the phone so you can comfortably read books or long articles without quickly draining the battery with a bright LCD display is a great idea in theory. I'm sold on the concept, but I don't think the YotaPhone is quite there yet.
Its e-ink screen is very low-quality, which makes doing even basic tasks with it unpleasant, and there's a definite lack of support for the display from third-party developers, meaning there's not much you can do with it just yet. If YotaPhone can use a better-quality display and work more closely with developers, its next-generation device might be worth checking out.
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I'd like to know if Moon+ Pro Reader would work on that e-ink screen, for example.

Likely not, because it's a third-party app?
As to battery life, I saw this interesting thing for the Sony Xperia Z Ultra:
http://www.mobilefun.com/41525-power...ra---black.htm
That should, at least in theory, give you more than
twice the device's battery life on any given day. Not quite as comforting as an e-ink screen, but at least providing the full-fledged experience.