https://www.cnet.com/news/samsung-foldable-phone-is-real-and-opens-extends-into-a-tablet-display-specs-galaxy-x-f/

"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." 

The device he showed isn't the final product. It's likely the phone Samsung releases will be sleeker and have smaller bezels than the device Denison showed.