Samsung has reportedly applied for a European trademark for a "Book Flex" with an unusual new addition: 5G. Therefore, it may have a convertible PC with this connectivity in the works. This leak offers no hints as to the putative next-gen device's further specs, OS and chipset included, however.
https://www.notebookcheck.net/A-new-leak-may-point-to-a-Samsung-Galaxy-Book-Flex-with-5G.484445.0.html