According to reports, Samsung is developing three next-generation smartwatches, all with 'Heart' codenames. One upcoming model is 'Heart-Pro', thought to be the Galaxy Watch5 Pro or the Galaxy Watch5 Ultra. While only available in one size, 'Heart-S' and 'Heart-L' may be better suited for people with smaller wrists.
https://www.notebookcheck.net/Samsung-Galaxy-Watch5-Three-codenames-and-model-numbers-emerge-including-a-Pro-version.617370.0.html