This news should come as no surprise. The Dark Knight Rises has been given a PG-13 rating from the MPAA, according to Warner Bros. 411 Distributor Service. Both Batman Begins and The Dark Knight were also given PG-13 ratings.
The reasons for this rating include the following.
"Intense sequences of violence and action, some sensuality and language."
Thanks to Collider for pointing out this bit of minutia. Though the film may be tweaked and slightly re-edited before its theatrical debut, the rating is very unlikely to change.