First off, 9to5 Mac notes that there’s support for new Emoji characters.
The Apple notes unspecific improvements in Siri, measuring your standing activity, calculating calories for indoor cycling and rowing, as well as your distance and pace during outdoor walk. It also vaguely claims improvements to “Accessibility” and “Third party apps”.
There’s also new language support, including Brazilian Portuguese, Danish, Dutch, Swedish, Russian, Thai and Turkish.
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