For years Samsung has been foreshadowing a phone with a foldable screen. Now they are committing. It uses their new “Infinity Flex Display” which allows the screen to fold without degradation.
CES 2013: Samsung first reveals folding phone concept with this terrible video
“The Infinity Flex Display represents an entirely new mobile platform,” Denison said. “We’ve been living in a world where the size of your screen can only be as large as the device itself. We’ve added a new dimension to help you browse, watch and multitask like never before.”