Perhaps it'll just be a cameo. Batman is scaling up a wall on his way to fight crime and a window opens and Superman leans out to say hello :-). On a serious note I too wish that they would do a solo MOS2 and if they're going to recast the role, a solo Batman film first, failing that, get Bale back. Even if this is only 'inspired by' DKR (which to me is highly over-rated if the recent 2 part animated adaption is anything to go by), it doesn't make sense to me to put a recast Batman in there, it needs to be Bale. And I agree with the poster who referenced Dark Knight Over Metropolis.