As of iOS 5, the keyboard can now be a variable height based on the input language. Specifically the Chinese language now includes an autocomplete section above the keyboard, very similar to what you see in Android. That autocomplete section increases the measured height of the keyboard.
Is there an even to which one may subscribe and/or receive notifications about when the keyboard changes dimensions as a result of the user clicking the "world" key? Note that this is different from getting the notification about the keyboard coming up (keyboardWillShow). In this case, they keyboard is already up, it's dimensions are simply changing as a result of user interaction.
Thanks!