Core Points - Apple officially released iOS 26, iPadOS 26, macOS 26 Tahoe, and watchOS 26 on September 16, featuring significant updates and new design elements [1][4] Group 1: New Features in watchOS 26 - watchOS 26 introduces a new Liquid Glass design language, enhancing the visual experience on various interfaces such as the photo watch face and control center icons [7][9] - A new "wrist flip" gesture allows users to mute calls and notifications or return to the clock or app list by simply rotating their wrist [10][12] - The control center has been improved, allowing for greater customization and the addition of third-party app buttons, making it more similar to iPhone and iPad control centers [13] - The fitness training app has undergone a UI update, now displaying training options in full screen with customizable buttons for easier access [15] - A new feature called "Workout Buddy" provides personalized voice encouragement during workouts, based on user data and fitness history [17][19] - Automatic volume adjustment for notifications and alarms based on ambient noise levels is now available, but only on select models [21][23] - The smart stack feature has been enhanced to provide context-aware suggestions based on user habits and sensor data [24][26] - The long-awaited Notes app is now available on Apple Watch, addressing a long-standing gap in functionality [27] Group 2: Technical Upgrades - watchOS 26 transitions Apple Watch Series 9, Series 10, and Apple Watch Ultra 2 to a standard arm64 architecture, improving performance and compatibility [29][31] - The update encourages developers to shift to pure 64-bit architecture for optimal performance, while still supporting older apps built on the previous arm64_32 architecture [34] Group 3: Additional Features - Real-time captions for messages are supported, enhancing accessibility [36][38] - Features like unknown caller filtering and call holding are synchronized with iOS 26, improving user experience [39] - The watchOS 26 update includes various minor enhancements, such as new button animations and additional watch faces [43][45] - Sleep scoring functionality is introduced, allowing users to track and improve their sleep quality [48] - Customizable widgets in the smart stack feature provide users with flexibility in managing their watch interface [50][52] - An automatic low power mode is activated when the watch is not in use, extending battery life [54]