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Apple previewed WatchOS 4 at its WWDC 17.
Apple WatchOS 4 is coming to Apple Watches this fall via a software update.
Three new Watch faces were revealed.
The new Siri Watch face.
More of the Siri Watch face.
Kaleidoscope Watch face.
Your photos can be used with the Kaleidoscope Watch face.
The Toy Story Watch face incorporates animated characters from the "Toy Story" movies.
The Music app is being updated.
The Workout app has new features.
Goals are being enhanced.
New Interval Training mode.
The Watch will now interface with workout equipment over Bluetooth.
You'll be able to connect to other devices via Bluetooth.
The WatchOS 4 gives you quicker access to the info you want.
This is a developing story. Follow our WWDC live blog for real-time coverage.
WWDC 2017: All the news so far