Henry Cavill's Superman sequel, Man of Steel 2, was tragically canceled in the months surrounding the reveal of James Gunn's DCU. Cavill's depiction of Superman has been largely lauded ever since he debuted in 2013's Man of Steel, after which he reprised his role in Batman v Superman: Dawn of Justice, Justice League, Zack Snyder's Justice League, and most recently, Black Adam. For his part, Cavill was also a fan of the role, with his departure being one of the more controversial consequences of the DCU's existence.
https://screenrant.com/man-of-steel-canceled-sequel-details/