IDK why folks keep saying the sequels getting hijacked.
It just means Bats will be a main character as opposed to a guy like Metallo, for example. Highly doubt Superman loses screen time.
It's Batman. His name alone takes up screen time. As a fan of Superman and MOS the sequel should be about Superman not Batman. Batman should have a non existent back story like the Joker in TDK. And impact on the film that makes him a side character like Cat woman in Rises. He should not be the main villain.