The Samsung Galaxy M54 5G just broke cover through Geekbench. The listing reveals the phone's model name is SM-M546B, and that it's powered by a Samsung s5e8835 chipset, which is likely the Exynos 1380.
The listing also reveals the Galaxy M54 5G will run Android 13 with OneUI 5 and have up to 8GB of RAM (it's very likely that there will be a 6GB version as well).
The listed chipset has a quad-core processor with two clusters - 4 cores running at 2.4GHz, and another 4 at 2.0GHz.
The run means that the phone is coming soon, though it may arrive in early 2023. It's set to replace the Galaxy M53, which came out in April.