Not spoilery.
http://www.newsweek.com/id/145508/page/1
Newsweek said:GORDON: This is a very grim movie.
NOLAN: Yeah, it is grim. But Batman is a grim character. It's a grim world. And that's part of the fun of itit's operatic. It's exciting. But it's definitely grim.
It's also something of a grim time in our country, which is why so many themes in this movie feel relevant. There's a line about how heroes always become villains if they stick around long enough. The idea is that, eventually, we turn on our heroes.
Yeah, we do. There are all kinds of famous examples. We talk about Caesar in the movie. But also Winston Churchill, who was thrown out of office after World War II. We try to portray Batman as a real person, and if a heroic figure is a real personsomeone who the entire population of a city puts their hopes and dreams ontothat hero will inevitably disappoint in some way. We will turn on them.
http://www.newsweek.com/id/145508/page/1