Performance and Navigation
watchOS now provides the ability to keep favorite apps in memory and to update information in the background. When users open your app from the new Dock or from its complication on the watch face, they'll experience quick launch times and immediate access to up-to-date information.
New APIs enable your apps to use camera data from HomeKit-enabled accessories.
Pay within Apps
Let users securely pay within your watchOS app using Apple Pay — right from Apple Watch.
The Face Gallery in the Apple Watch app on iPhone now displays an app’s available complications.