The well-known display supply-chain commenter Ross Young has released a projection in which foldable devices with ultra-thin glass (UTG) protection easily outdoes the first-gen Galaxy Fold (which has a polymer-coated display) in terms of sales in 2020 and onward. Accordingly, the leaker now believes that Apple will also go with UTG in its own eventual foldable devices.
https://www.notebookcheck.net/Apple-foldables-may-launch-with-UTG-from-Corning-display-industry-leaker.481098.0.html