I have seen the following reports in the Apple Support Communities of problems with language support:
+Greek keyboard missing at some stage, so that users with Greek characters in their password can't get access to their devices. (Fixed with update 7.02?)
+Broken display of Arabic and Korean in some apps.
+New 10-key (T9) Pinyin Chinese input method is only present on devices sold in China .
+New 10-key (T9) Korean input method only present on devices sold in Korea.
+A new, modernistic default font for Thai which some users find barely legible.
+The new Tamil99 keyboard has wrong characters on a number of keys in the shift level.
+Copy/paste causes crashes when the OS is running in Hebrew.
(This is the first time I have ever seen Apple issue an OS with some keyboards only available in one country. They had to suddenly remove reference to the Chinese one from a long-standing webpage describing new features in iOS 7)
Contributions by readers of other items to this list are welcome.
+Greek keyboard missing at some stage, so that users with Greek characters in their password can't get access to their devices. (Fixed with update 7.02?)
+Broken display of Arabic and Korean in some apps.
+New 10-key (T9) Pinyin Chinese input method is only present on devices sold in China .
+New 10-key (T9) Korean input method only present on devices sold in Korea.
+A new, modernistic default font for Thai which some users find barely legible.
+The new Tamil99 keyboard has wrong characters on a number of keys in the shift level.
+Copy/paste causes crashes when the OS is running in Hebrew.
(This is the first time I have ever seen Apple issue an OS with some keyboards only available in one country. They had to suddenly remove reference to the Chinese one from a long-standing webpage describing new features in iOS 7)
Contributions by readers of other items to this list are welcome.