The biggest change coming to Apple Watch is apps being able to run their logic on the Watch rather than an iPhone. This potentially speeds up apps and makes Apple Watch more independent; apps will be able to
2communicate with known Wi-Fi networks, and more directly access hardware, including the Watch’s speaker, mic and Taptic Engine.
The watch face is getting more customisation options. Developers will be able to create their own complications to show, say, flight times or car battery charge details. Combined with the new Time Travel feature – previewing your day by using the Digital Crown to temporarily adjust the time – the watch face will be far more useful. And it will be more beautiful and personal too, with new faces that show time-lapse videos of famous landmarks, or your synced photos.