New watch faces, an always-on and larger display (thanks to smaller bezels), along with better durability are the highlights of the new series. There's better menstrual cycle tracking thanks to a new suite of features, including a new temperature sensor to get ovulation estimation, among other things.
There are also new safety features, such as crash detection to provide automatic notification to emergency services and contacts. It's made possible by updated motion sensing with a new gyroscope and accelerometer.
Low power mode disables some of the less necessary features, like the always-on display, to extend to a claimed 36 hours. International roaming will also be rolling out on all cell models running WatchOS 9.
And pretty new colors and bands.
Prices start at $399 (£419, AU$629), and include three months of Apple Fitness Plus for free. It's available Sept. 16, but preorders are open now. WatchOS 9 will be available starting Monday, Sept. 12.