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.
"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."