Variety has confirmed a Breaking Bad movie is in the works. Production is suppose to start mid November 2018 through February 2019 with a working title of "Greenbriar."
https://variety.com/2018/tv/news/bre...ks-1203021681/
With what was announced for The Walking Dead it is probably safe to say this could confirm Better Call Saul might end with its next season with this movie showing up on AMC sometime in 2020.