One of my favorite features of iOS 10 is Raise to Wake. That is great for people that set their phone down often and it's easier to get back to what you were doing without having to turn the screen on.
Guess what, the keyboard itself successfully interprets multiple language text input and reacts accordingly. It does a neat job.
But the keyboard has a dictation key.
Today I tried to dictate in multiple langues without switching the keyboard. I started out with English, and it was fine. Then I spoke in Spanish, and it still thought it was hearing English and interpreted my speech as English (of course, with gibberish as a result). Why couldn’t it figure out that it was Spanish and switch to Spanish transcription automatically?
So technically, this feature will be more completely implemented when iOS can hear another language, successfully identify the language being spoken, and accept dictation and do text-to-speech for that language seamlessly.
I don’t expect them to handle 15 or 20 languages in the beginning, but at least implement handling for the basic and most-oft used languages, like English, Spanish, French, German, Italian, and—hey—Greek would be super cool.