That is a dual sided smartphone prototype. E-ink is showing it off this week at IFA Berlin. I don't have any details yet on whether the second screen has a touchscreen as well, but it looks to me like this gadget is running Windows Phone, not Android.
There's no word yet on which device maker has committed to the idea, but E-ink is saying that someone has a similar design in the works. And I'm sure more will release their own version. You can just look at it and know that someone will want to buy it. But will it be cheap enough? That's another question.