Apple could be working to build third-party watch face compatibility into the next OS upgrade for the Apple Watch.
According to code discovered by 9to5Mac in the latest watchOS 4.3.1 beta, there’s a placeholder that literally says “this is where the 3rd party face config bundle generation would happen.” This indicates that the company is beginning to make the system compatible with third-party faces and could introduce the feature in the next version of watchOS, watchOS 5.
It’s worth noting that there’s nothing in the system that indicates we’ll see third-party watch face support in watchOS 5 or at all, but this reference still hints at the possibility that the feature will come at some point in the future. And considering we’re seeing it just a couple of months before WWDC 2018 where Apple’s likely to unveil watchOS 5, we can only assume the company will make an announcement regarding this rumor.
Until then, we can only cross our fingers that Apple will open its watch face plethora to third-parties. Stay tuned.