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According to Collider, Cavill has been in negotiations with Warner Bros. about extending his Superman contract beyond the one movie he has left. The plan is to make Superman the “glue” that connects all of the DCEU movies together. Collider says the hope is that Superman will make “small, but memorable, appearances” in the movies, much like Samuel L. Jackson’s Nick Fury has done in the Marvel movies. Collider notes that while they heard this from “very reliable sources”, they haven’t been able to get 100% confirmation, so treat this as a rumor for now.
From Batman News: