The rumors about the possible sequel to “Big Hero 6” emanated from the statement made by Marvel Comics director Stan Lee when he said in an interview last year that after “Ant-Man,” they are going to start playing around with “Doctor Strange,” “Black Panther,” “Inhumans” and then they have to come back for “Guardians of the Galaxy Vol. 2,” “Big Hero 6,” “Avengers,” and “Captain America.”
Obviously, Stan Lee mixed everything up so as to throw off speculations. As everyone knows, “Ant-Man” came out of the theaters in June of last year while the third “Captain America” movie was just shown in May.
The “Avengers” movie that Lee included in the list is likely the two-part “Avengers: Infinity War” whose release dates have already been confirmed for 2018 and 2019.
“Doctor Strange” is set to debut in November this year and its first official trailer came out during the showing to global theaters of “Captain America: Civil War” shown in May.
“Guardians of the Galaxy Vol. 2” already has an April 2017 playdate while the “Black Panther” will hit global cinemas on July 6, 2018.
Given this timeline of release dates, it is possible that Stan Lee shall be able to work on the sequel to “Big Hero 6” after the work on “Avengers: Infinity War” which would most likely be finished in 2018.
Thus, it is likely that “Big Hero 7” will come out to theaters in 2019 at the earliest, with 2020 being the farthest release date.