A report published by Microsoft Research has described an Integrated Display Cover for use in conjunction with a regular smartphone. The Display Cover would offer users an additional e-ink display for viewing information, thus increasing the amount of screen real estate available. Concept images of the cover were shared on Twitter.
https://www.notebookcheck.net/Microsoft-demo-reveals-Integrated-Display-Cover-concept.347091.0.html
Great way to get users accustomed to dual screen device, usage of pen and ms apps at once. Would be even better if it could be used with screen bent on the back and if pen would be included in cover.
Actually what are they waiting for...