Man of Steel 2

Man of Steel 2 is a sequel to the movie 2013 film Man of Steel based on the character of Superman and continuation of Batman V Superman, being part of the DCEU.

Plot
According to the details given by Zack Snyder, the plot would revolve around Superman confronting Brainiac, who has freed Faora and the prisoners of the Phantom Zone, who would eventually help Superman to defeat Brainiac.

Why It Was Cancelled

 * 1) Warner was not happy with the dismal critical reception from both critics and audiences of Batman V Superman: Dawn Of Justice, which added to the box office and critical disappointment of Justice League (2017), so they buried any possibility of any solo movie of Henry Cavill's Superman.

Results

 * 1) Warner plans to release a reboot with an African-American Superman, which will be set in an alternate reality like Robert Pattinson's The Batman.
 * 2) The last appearance of Henry Cavill's Superman was in Zack Snyder's Justice League, the future of this Superman is uncertain for the moment.

Source:
https://comicbook.com/dc/news/zack-snyder-reveals-man-of-steel-sequel-brainiac/