A TV movie,
Baymax Returns, which premieres on November 20 will begin the series. Two full-length preview episodes of
Big Hero 6: The Series will then be made available exclusively on the DisneyNOW app and Disney XD VOD. Episodes of the series will begin airing on TV in 2018.
http://www.ign.com/articles/2017/10/...turns-tv-movie
Here are some sneak peeks.