Nintendo has posted a video with the producer for Breath of the Wild, Eiji Aonuma talking about that Chinese, Simplified Chinese and Korean languages will be coming to Breath of the Wild in early 2018 next year. With these new languages, Breath of the Wild will have 12 different language options to choose from.
https://www.youtube.com/watch?time_continue=2&v=o5mftsnuV9o
Its seems that Nintendo really want to push Switch with Zelda on Chinese market.
http://gamrconnect.vgchartz.com/thread.php?id=231714&page=1