Rockstar say it'll be a new approach to the Heist system, with more choices and replayability. The Diamond Casino Heist asks players to break into the most secure location in the state, in the 'biggest, most audacious, most complex criminal operation ever to hit Los Santos'. Grand Theft Auto V Rockstar Games Online Multiplayer Online Co-op Third Person Shooter Heidi Nicholas Rockstar have confirmed that there's a new Heist coming to GTA Online later this month on December 12th.