At first glance, I thought it is again a bulky two screen tablet. After watching the video, I realized that it might become a great idea in future for devices communicating with one another. Meet this e-Reader where Microsoft Research has a role to play in its development.
In the video, you can see that it can transfer the information wirelessly to a nearby device or by just linking them together (with magnets). Actually, I would much prefer NFC as a communication media, and a retina display or IPS screen . Anyway, here is the video.