Lois can still be a KEY player even WITH Batman. First of all, forget the World's Finest movie. It won't work now, and even if it does, it's not the movie Superman needs yet. But if Lois conspires with Superman to take Lex down, Batman can play a peripheral role by being a mysterious character who is only unveiled in the third act. I'm telling you, for this to be a proper MOS2, Batman would have to be a character who appears, complicates, and leaves. As soon as it's a team-up, it all becomes silly, and the focus changes from Clark and the people around him to Superman/Batman saving the day. Again, the only way to make this a good part II is to show Batman as a minor character in the last half hour of the movie, letting the rest be divided up with Clark, Lois, the Daily Planet, a prominent superpowered foe (not Luthor), the conspiracy against Superman, and a mysterious stalker observing both Clark and Supes (which turns out to be Batman). By having Batman reveal his purpose during fighting, Clark can realize his ultimate form of submission would be to try to avoid conflict, only to realize that Batman doesn't take to quiet conversation well. In between blows, Superman tells him the truth, because he's afraid of physically hurting Batman, and wants to show him the gravity of the situation. They can both stop fighting (and in Superman's case, spinning around so that Batman has a hard time holding on). Thus the VS part of the story is fulfilled. And then having cleared up their differences, Batman can leave, knowing that Superman is stronger than he can ever be, and that at best, he can serve as back-up, and exits from the story. Sure, some people might ask what the point of Batman was, but I'm sure there will be many commentators telling on how he is a personified representation of human fear, anger, mistrust, and obsession. And he would be too small a character to the movie to "ruin it." But they'll probably WarMachine the final moments, and that's if the rest of the narrative was still MOS2. The movie we get will probably be World's Finest, for good or ill.