Samsung is currently believed to have a 5G version of its Galaxy Z Flip in the works. Several new listings on the Bluetooth Special Interest Group (SIG) website confirm this, overtly naming multiple versions of the same device in these terms. One of them has also gained a certification to use NFC.
https://www.notebookcheck.net/Samsung-Galaxy-Z-Flip-5G-NFC-and-Bluetooth-certifications-put-the-upcoming-2020-clamshell-close-to-launch.477346.0.html