It looks like 6" Reader with eInk FLEXIBLE screen named WEXLER.Flex ONE is available now in Russia
http://www.wexler.ru/home/products/books/380 (google can translate it for you if need it). Interesting information. Did somebody already buy it and can share his experience?
As you can see from the specifications - no SD card slot (but 8 GB of internal memory, which is not bad). I just wonder if there might be the problem with putting SD card into any FLEXIBLE eInk screen, since SD card is not flexible itself?