In following the official Garmin channel on YouTube, these 2 videos have just popped up in my subscription feed. The app is shown working with the Fenix 5 Plus series too, but I can’t find the app in the Apple App Store yet though. Exciting stuff non the less.
https://youtu.be/6BznYk-5UtY
https://youtu.be/nCXSaYlR4mI
Edit: links don’t work now, see later posts.