Sure, Batman v Superman: Dawn of Justice technically classifies as a sequel to Man of Steel, but it can't really be called a standalone Superman film. With the DCEU schedule already filled out for the 4 years, what are the chances of Superman anchoring another standalone film before Cavill's time as Kal-el is up. Zack Snyder stated, "I think if we can get a good script, it would be great to get a standalone Superman movie. I think that would be fun to do...Part of the reason we didn't announce a standalone superhero movie is to support some of the event of [Batman v Superman]. "
When asked the same question, Henry Cavill replied, "I do believe it depends on the success of this movie. If this goes well then we can start to negotiate with Warner Bros. for a standalone Superman movie. But they've got their plans set out for other stuff and Justice Leagues and various other movies, so it's about finding the time, really. It's something that I would be very keen to do."
DCEU producer Charles Roven stated that internal discussions are actually taking place right now about whether it makes sense for another standalone Superman movie. "We're in the process of looking at that, but we don't have it on the schedule at the moment because we're quite busy with the movies that we have scheduled."