We have previously reported, on 12th September to be exact, on a firmware update R800XXU1BRH3 being released for the Galaxy Watch - this update began its global rollout soon after the watch had been launched.
The relatively small update, measuring in at 33MB, has now been spotted in several European countries, with the UK and Belgium being the first, to get it.
Update: Australia is now getting the update as well.
There are not any new features to brag about with this update, but according to the changelog, this update was to improve the device stability and also bring an improved Samsung Health experience.
You should get the update over the course of the next few days/weeks depending on when Samsung's servers will release to update to your specific country/region. You should automatically get a notification about the update, but if not use the manual procedure outlined below to check for an update.
You should get a notification that an update is available, but you can also check manually by launching Galaxy Wearable App -> About watch -> Update watch software -> Update now.
Let us know if you have received this update and state your country.