How exactly do you get a two hour film out of THESE two franchises given what we saw in Man of Steel?!?
There has always been this sort of friendly argument amongst comic book fans over who would win in a fight between Bats and the Big Blue boy scout, but almost EVERY single scenario offered in which Batman could conceivably SURVIVE such an encounter (let alone actually WIN it) has been based on the premise of a.) the employment of kryptonite as a weapon and b.) Batman supposedly being willing to go to greater limits to defeat an opponent than Superman.
Scenario A doesn't seem viable since the Man of Steel mythos didn't seem to introduce kryptonite as a weakness, nor does Snyder seem inclined to go back on that as a convention.
Scenario B has never held much weight because Batman is as loathe to cross that "one special line" as Superman is, even when both characters probably share a great deal of responsibility for all the lives lost by NOT taking out final justice to end some of their more psychotic murdering villains.
In fact, Superman has only really crossed that line once in canon, when he slew Doomsday and that was only justified because he was going to die in the process, thus nobody would have been left to stop the creature if he had fallen.
Most of the other heroes were lucky to have escaped with their lives (some of them never really escaped to be honest.. it haunted them to the end of their days.)
I've also never really liked that argument that placed on equal terms Batman had the fighting advantage. Superman may have had super strength but he's still brawled with some of the best fighters in the UNIVERSE. At some point he learned how to stand toe to toe with someone when it comes to fisticuffs, and even minus his powers Clark is an imposing physical specimen of a man. Plus, to have to arbitrarily handicap Superman from the start just to win the argument is pretty much trying to give the win to Batman on easy mode. Oh gee well if Superman can't have his powers that define his character, then Batman doesn't get to have his gadgets or extensive training at the hands of Ninja masters and such. Fair is fair.
I digress.
The movie version of Superman from Man of Steel would flat out kill Batman before Bruce even knew he was coming. Hell, if they go with Nolan's Batman there won't even be much of a fight, since that stiff, slow ass Bat-suit was more a hindrance than anything else. Batman got his rump handed to him TWICE by Bane, who didn't even have his venom. He could barely hold his own against the Joker. In fact if you think about it, Batman pretty much SURVIVED the climax of his films rather than 'won' any of those particular engagements.
The best I can hope for is that they'll return to more comic book based writing in the next iteration of Batman.. lighten him up a little.. go more towards the Adam West end of things now. We've seen dark batman get darker and darker, let's make him more Brave and the Bold now.
Then we might actually have an interesting film.