Music on Apple Watch was previously limited to select playlists which had to be synced from the iPhone over Wi-Fi for standalone layback. watchOS 4.1 lets Apple Music subscribers view their full library of music for streaming over Wi-Fi and even cellular on Apple Watch Series 3 with LTE.
watchSO 4.1 also includes a new Radio app for streaming Apple’s Internet radio stations including Beats 1, NPR, ESPN, and artist stations. Beats 1 is free to access while the other stations require an Apple Music subscription to stream over Wi-Fi or LTE.
Apple has also enabled GymKit support which lets Apple Watch pair with upcoming gym equipment for sharing workout data between devices (like heart rate from Apple Watch and incline from a treadmill) to give you the most accurate credit.
