Re: MAN OF STEEL 2: Superman/Batman (2015)
I don't think his role will be particularly small, but from what Snyder and Goyer actually said it is a Superman movie with Batman in it. They used the logo to show that Batman was involved but certain people want to believe it is somehow now his show instead of what Snyder said "another Superman movie".
Henry Cavill is Superman/Clark Kent
Stana Katic, Natalie Dormer, Scarlet Johansson or Rachel McAdams for Lois Lane
Ben Affleck is Batman/Bruce Wayne