A new device with a foldable main display has been patented by...Fujifilm. The iconic camera brand has indicated that it does indeed intend to move into this market with a first-gen product that looks most like the Samsung Galaxy Z Fold3. On the other hand, it may not have the exact same use-cases as this new premium phablet.
https://www.notebookcheck.net/Fujifilm-prepares-to-get-in-on-the-foldables-game-with-its-first-device-patent.562620.0.html