Now, though, the studio has gone ahead and released a more thorough synopsis.  It doesn't particularly tell us anything that we didn't know already, but it's still appreciated.

Before we get to that, though, there's some running time news.  A 2 hour, 44 minute length was previously rumored, and now the British Board of Film Classification has confirmed that The Dark Knight Rises will indeed clock in 164 minutes and 27 seconds.  That makes the third film the longest in the series, surpassing the 140 and 152 minutes of its respective predecessors.  Plan your pee breaks accordingly.

And here's the new synopsis from the official site, with the actual story bits emboldened for your convenience:

Warner Bros. Pictures’ and Legendary Pictures’ “The Dark Knight Rises” is the epic conclusion to filmmaker Christopher Nolan’s Batman trilogy.

It has been eight years since Batman vanished into the night, turning, in that instant, from hero to fugitive. Assuming the blame for the death of D.A. Harvey Dent, the Dark Knight sacrificed everything for what he and Commissioner Gordon both hoped was the greater good. For a time the lie worked, as criminal activity in Gotham City was crushed under the weight of the anti-crime Dent Act.

But everything will change with the arrival of a cunning cat burglar with a mysterious agenda. Far more dangerous, however, is the emergence of Bane, a masked terrorist whose ruthless plans for Gotham drive Bruce out of his self-imposed exile. But even if he dons the cape and cowl again, Batman may be no match for Bane.

Leading an all-star international cast, Oscar(R) winner Christian Bale (“The Fighter”) again plays the dual role of Bruce Wayne/Batman. The film also stars Anne Hathaway, as Selina Kyle; Tom Hardy, as Bane; Oscar(R) winner Marion Cotillard (“La Vie en Rose”), as Miranda Tate; and Joseph Gordon-Levitt, as John Blake. Returning to the main cast, Oscar(R) winner Michael Caine (“The Cider House Rules”) plays Alfred; Gary Oldman is Commissioner Gordon; and Oscar(R) winner Morgan Freeman (“Million Dollar Baby”) reprises the role of Lucius Fox. The screenplay is written by Christopher Nolan and Jonathan Nolan, story by Christopher Nolan & David S. Goyer. The film is produced by Emma Thomas, Christopher Nolan and Charles Roven, who previously teamed on “Batman Begins” and the record-breaking blockbuster “The Dark Knight.” The executive producers are Benjamin Melniker, Michael E. Uslan, Kevin De La Noy and Thomas Tull, with Jordan Goldberg serving as co-producer. The film is based upon characters appearing in comic books published by DC Comics. Batman was created by Bob Kane.