A leaked firmware update from Garmin all but confirms that a new solar-powered wearable is coming from the outdoor tech company. The Garmin Instinct 2 Solar, as the device is likely to be called, will feature a solar-powered recharge system, a Pulse Ox sensor, and a few other features.
https://www.notebookcheck.net/New-firmware-leak-hints-at-solar-powered-Garmin-Instinct-2-Solar.447195.0.html