Today, Samsung has updated the Gear Watch Designer App and renamed it as Galaxy Watch Designer. This is the seventh major update to this application, but Samsung are still classifying it as a Beta release.
The update brings with it support for the newly released Galaxy Watch and falls in line with its new naming convention of devices and apps like Galaxy Wearable. The app file format still remains as a gwd file, but we lose compatibility with 1.5.2 (or older) versions of Gear Watch Designer. There is also new functionality as detailed below:
New functionality that that lets you create various dynamic effects on your watch faces. In each input field, you can enter an arithmetic expression tag that certain actions can be based on; like a blinking dot or a heart rate monitor.
In order to increase security and protect users personal data, Galaxy Watch Designer now supports runtime permissions. In Galaxy Watch designer you need to set the API version to Tizen 4.0 and build the .tpk file, which automatically generates the runtime permission feature.
You can now change the preview image of your watch face. You simply need to select the watch image that shows the time and data you want.
This is the first version of the watch designing app supports Tizen 4.0, the version of the OS running on the Galaxy Watch. I would suspect that all existing watch faces, that have been created with Gear Watch Designer, would need to be rebuilt using Galaxy Watch Designer in order for them to be compatible with the Galaxy Watch.
You can download the Designer app and access additional resources from the website.