According to industry insider Daniel Richtman, there is a very small chance that Doctor Strange 3 will be released between Avengers: Doomsday and Avengers: Secret Wars, which are

Avengers: Doomsday is still more than a year away, but it’s not too early to learn a few of the movie’s secrets. For instance, Doctor Strange won’t be appearing in this next Avengers film, apparently.

Benedict Cumberbatch revealed that the Sorcerer Supreme is almost definitely not in for the the next big Marvel team-up film.