If they are smart
Big if
I don't think batman will make superman his sidekick. It will likely start antagonistic ally, I really hope they don't add in the "I want you to remember Clark" , that would be..........bad as superman rises to the challenge he finds the moral footing that makes him superman and he acts in the world as Clark, which lets him see the world through our eyes
I'm expecting some dialogue by the end with superman having the upper hand and inspiring batman to become a hero again by inspiring him
It depends if they get the characters or just write fan fiction
And then