In TDKR, Batman faces off against his most serious threat yet. Bane is a psychopath who can physically take on and overwhelm the Caped Crusader. And since this is the last part of the trilogy, some speculation about the film has focused on whether or not Batman will make it out alive.
Without spoiling the film, it should be noted that even the actors recognize that the movie has an emotional depth that its fans should be prepared for. Gary Oldman has even publicly said that the movie "packs an emotional punch."
This film is easily the most emotional one in the trilogy, and if you are so inclined, you might want to bring tissues to the theater in preparation for how this final chapter ends.