Chief among the new features are a trove of new watch faces, with the most intriguing one being the intelligent Siri one.
The Music application on the Apple Watch has received a new interface as well. The face automatically displays all the info that's most pertinent to you using machine learning, so it can adjust to your usage patterns and settings to provide the most applicable info depending on the time of day.
Other watch faces include more characters from the Toy Story as three new characters have joined Micky and Minnie.
The activity tracking has updated as well with more functionality and the Workout app has a brand new UI.
Apple Watch will now be able to use near-field communication to interact with gym equipment to pull stats such as incline and speed.
watchOS 4 also adds a new Music app.
05/06/2017: Apple has revealed its latest watchOS operating system at WWDC 2017, showcasing some significant Siri integrations and improved fitness tracking. You can also pick a playlist that automatically starts with your workout, giving you some extra on-wrist control.
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SAN JOSE-Apple announced the next iteration of its wearable software at its annual developers conference today: watchOS 4. All Watches will be eligible to release the operating system for free once it is released in the fall. You can also do multiple workouts in a single session, like triathletes do.
One of the things Apple is updating is the watch face.
The activity tracker has also received some added features, including challenges that reward you with some fancy screen animations for completed milestones.
Apple revealed a new vertical-scrolling dock, a new music app, and the arrival of Apple News. watchOS 4 is available as a demo to developers now, but rolls out to everyone else in the fall. Furthermore, gym equipment manufacturers will be supporting this in the future as well.
The Apple App Store is also getting a revamp, picking up clues from Apple Music's design which has apparently been successful with the public. Native core bluetooth support, for example, is coming to Apple Watch. We'll update this article when we know more.
The user can also ask Siri about the musicians playing the current song and even tell her "Hey Siri, I like this song" to record the user's tastes, mood, and preferred genres.