Why does this movie need female characters anyway? With the exception of Catwomen in Batman Returns, all the women in the Batman movies have been boring. Batman doesn't need a love interest in every movie. It would be refreshing to have all the main characters in a movie be male for once.
Or... (shocking suggestion coming up)... How refreshing would it be to have one or, heck, maybe even several female characters, but make them interesting and important to the story and as active as the male characters?
I really don't get the logic "this or that movie franchise/TV show has had boring female characters, so let's just remove females altogether and only have male heroes since they're only worth it, females suck". Well if they suck, it's because they're written that way, so how about trying to write them better?