Samsung has pushed an update to its original smartwatch, Galaxy Gear converts it to Tizen OS and puts it on par with its successors. However, the new operating system (firmware v2.2 on the Galaxy Gear) introduces little changes to the actual user interface, so you won’t need to get acquainted to it again.

What the update does bring is a standalone music player so you no longer need your phone when you go out for a run. It will also improve the battery life as Tizen has been found to be easier on the hardware than Android.
To apply the update you’ll need to connect your Gear to your PC and use the Kies software. It will wipe all your data, so make sure to backup any valuable files you might have before proceeding.