A phone called the Samsung SM-M315F has appeared on Geekbench. It may be a successor to the Galaxy M30, although it seems to have the same chipset as the M30s and A51. Should this be the case, there may be little to differentiate it from the new mid-ranger.
https://www.notebookcheck.net/The-Samsung-Galaxy-M31-may-have-popped-up-on-Geekbench.448648.0.html