+Cantonese keyboard predictions: The new Cantonese predictions for Traditional Chinese Cangjie, Sucheng, Stroke, and Handwriting keyboards bring more relevant character and emoji predictions to Cantonese users.
+Improved Japanese predictions: A new neural language model takes words typed earlier in the sentence into account, so predictions are more grammatically consistent and relevant to the subject matter.
+New fonts for Indian languages: Get 34 new fonts, including four system fonts and 30 document fonts, for languages like Gujarati, Hindi, Kannada, Odia, Punjabi, and many more.
+New Indian English Siri voices: All-new Indian English male and female Siri voices allow Siri to be more natural and expressive.
+New dictionaries: New dictionaries include Thai-English and Vietnamese-English.
The interface language of individual apps can now be changed independently of the system language.
Because Mac and Windows keyboard layouts for many languages are slightly different, it can be confusing to use an Apple hardware keyboard with Windows which has been installed on a Mac. The usual fix is to find, inside the WIndows install, a layout which has (Apple) after the normal name. Where that does not exist, you have to download and install a custom layout in the Windows system. A source for these is