Since late yesterday GamePolitics has been following a rumor that hackers had discovered a means to reveal the original, unedited content of Manhunt 2. In other words, the version rated "Adults Only" by the ESRB.
Now GamePolitics has the confirmation from a Take Two representative that it's not a rumor. It's true.
According to Take Two, the hack does not reveal the entire AO-rated version of the game, only a portion thereof.