Batman doesn't have conclusion, there is no full stop after the character, never has been, even if Nolan fixes the imbalance of Batman being perceived to be the one who committed the murders he's not going to wrap everything up in a nice tidy bow for film 3. Batman has to always remain an open ended story and Nolan is well aware of this. Batman is on the run by his own doing, he made the choice, there's nothing to resolve there, Joker was captured, Dents reputation salvaged, Gotham City saved, you don't need to continue the story, you can, there's plenty of room to, but you don't need to. It's not like I said Empire Strike Back where it's clear the story has to continue. Those questions you asked, people can fill in the rest with their minds, the only reason people think he left us 'hanging' is because the ending wasn't the typical way a film like this ends, had it been some regular crime drama you think people would be crying for 'conclusion'? I doubt it. But we're getting a third film now irrespective of how film 2 ended so this is all kinda pointless to talk about.