Charles Roven has stated that ‘Man of Steel 2', is in the queue.
However, there’s ample time for it since DC Comics has planned other movies with Warner Bros for now.
Back in 2014, when the list of movies that Warner Bros was doing was released, the solo Superman and Batman wasn't a part of it, and the exact details of the movies were not unveiled.
In one of his promotions of ‘Batman vs. Superman: Dawn of Justice’,
Zack Snyder conveyed that if a good script is sketched out, doing a standalone movie for Superman would be great. Also, the sequel to ‘Man of Steel’ should arrive sometime soon.