Cantonese Is Not Yet Available

Environment: Dev & QA
Cantonese has been withdrawn as a language option for launch. It still appears in the Settings language list, marked "(not yet available)" and not selectable, so it is clear the option is coming rather than gone.
If your language was already set to Cantonese, voice practice now uses the standard voices instead of the Cantonese ones. Every other language is unaffected.