Chinese is on the way
People are discussing it in this reddit thread https://www.reddit.com/r/ChineseLanguage/comments/6qxkhv/duolingo_now_hiring_teaching_expert_mandarin/
Nope. I'm European. #NonChineseInThisSingleFormBandTogetherBecauseWe'reTheOnlyNoneChineseHere, catchy ain't it?
I'm looking forward to it!! I've been studying Mandarin on and off for years, but a Duolingo course would really give me a huge boost and great way to practice regularly.