A few days ago, i saw the announcement that anne hathaway and tom hardy were going to play catwoman and bane respectivley ( isn´t that obvious). It came to a shock to me but i have faith in nolan. I really dont know how will he portray catwoman cause she has alot of fawcetts that could fit in his world so it is really dificult to guess the only thing we have for sure is that she will be a love interest or female atraction for batman, and in my personal opinion he will use the duality of catwoman being a hero and part time villain.Now bane on the other side, is a really mysterious choice, how is he going to make it work to make it fit into his world?... In batman begins, he made plausible the idea of a frightening gas that could make you allusinate to show you your greatest fears, so i think he could make it work by telling bane could be a test subject of prototype steroids or some kind of altered adrenaline, that was chosen from arkham thanks to his intellect and maybe the tester could be the scarecrow. Know that bane is a physical and mental threath i think nolan is going to explote both, maybe he will incorporate some of the riddlers personality into him.
But i truly believe banes true mision is to break batmans back, but not in the beginning i think it would work out as a final. As he has already stated this is his last movie so nolan being the genious he is he will try to end it with a close conclusion not an open thing ( that is why think he is going to be mention harvy dent and the joker somehow in the movie, hes just not the kind of guy that can put away a project and treat it with less respect than it deserves). I think the perfect way to end the trilogy is to leave as a legacy thing. IF bane definitaly breaks batmans back leaving him in a weel chair he will be unavaible to fight crime anymore. So he will depend on the legacy of rightneousness he has input on gotham.
That why the las scene on the movie i think should be wayne in a wheel chair maybe having a talk with dick something like that about the legacy his poassing to him. I dont know how to portary it i lack of imagination.
But i think the better way to end it is to leave batman as a symbol that many will follow even though the physcial embodiment of that symbol no longer exists.