The new firmware for the Samsung Galaxy Watch Active is based on Tizen 4.0.0.3, the same version that came with this smartwatch at launch. The update has less than 14 MB in size and is currently rolling out in the US. It brings several minor improvements and lacks any new features.
https://www.notebookcheck.net/Samsung-Galaxy-Watch-Active-gets-its-first-software-update.416170.0.html