I'm really not sure. E-Ink has created flexible displays they call Mobius, but as yet nobody's created a "mass market" eReader based around them. There are reasons... the Mobius displays are lower resolution then the glass-based displays, and E-Ink doesn't make Mobius units in the traditional eReader sizes.
Sony's Digital Paper unit runs on a 13.3" Mobius display, but it's hideously expensive and not really meant as an eReader. Pocketbook announced a Mobius based unit called CAD back in 2014 but it has never made it to market.
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