Sony's DPT-RP1 is the company 2nd-gen 13" Digital Paper tablet that features a 1650x2200 (206 DPI) Mobius flexible E Ink touch display, Wi-Fi and support for handwriting input.

Sony DPT-RP1 photo

The DPT-RP1 will cost $700.

E Ink display info: 
1650x2200 Mobius flexible E Ink display