The 400 MS Point GAC Pack will feature two new game modes as well as the Jack Pack and Shadow Pack content that was previously only available as pre-order bonuses.
The new Assault on the 87th Precinct mission will let you play as Grant City's Anti-Crime Soldiers (with sniper, brawler or tank classes) to experience the game from the bad guys' point of view.
On top of this, Riot Control mode will put you back in control of Rick and Shadow to do battle with increasingly difficult waves of GAC enemies.
Thanks to Destructoid.