The latest leaks suggest that Samsung might call its next premium foldables the Galaxy Z Fold3 and Z Flip3, and confer rear cameras like those of the S21 Ultra and S21 respectively on them. Now, according to the prolific leaker IceUniverse, they might launch in the second half of 2021.
https://www.notebookcheck.net/Samsung-might-launch-the-next-Galaxy-Z-Fold-and-Z-Flip-in-July-2021.519281.0.html