Bane's deal is that he was beat up and left for dead and the Dr. at the prison rigged him up with a face mask that releases some sort of pain medication that keeps him alive and gives him super strength (probably because he can't feel pain?). He is 'pissed' because he is basically trying to finish what the League of Shadows started. Miranda is Talia's fake name and identity she created to try and get close to Bruce, in order to get revenge for her dad who was killed by Bruce, also because Bruce is a pretty powerful guy. She has some sort of "environmental corporation" that is a front for her shenanigans. She was originally going to get in business with WayneCorp 3 years ago for that reactor thing, but then Bruce chickened out because he was afraid it would be used for a weapon. He later goes back and agrees to get in business with Talia because the contract would give her a controlling share of Wayne Industries over Daggett. The bomb isn't set for 5 months, that's just how long it can last away from the reactor before it blows. Bane told everyone a regular person had the detonator to create anarchy and chaos. People wouldn't trust each other if they thought their friend or neighbor could be the person holding their life in their hands. People do have boats. Selena is working for Bane through Daggett because she was promised that if she cooperated they'd erase he record and she could start fresh. Bruce Wayne is injured because he's old and beat up from his days being Batman, and probably from the fall he took when he killed Two Face in TDK. JGL is mad at Gordon because he thinks he's been a coward for letting Batman take the fall for Dent for 8 years. JGL didn't know where to find Dent, but when Foley told him to get lost he went around back to an alternative entrance he must have known about it just so happens that's where the sewer dumped Gordon.
So what was Bane and Talia's point of doing that whole five month thing and quarantining off Gotham? They had all these demands like if anyone crossed they would blow up the place. But they were going to blow the place up anyway.
So what was the point of the entire last act?
Her "motivation" was to avenge her father and/or fulfill her father's dream. So their plan is to draw the whole thing out for five months while Bruce Wayne watched from a tv in a dungeon? They didn't even have any demands. Did anyone in the US government ask them for any demands?
Horrible movie.