More and more it seems that Rockstar is adopting a policy of announcing and releasing new GTA Online content simultaneously.

The developer of GTA has been stepping up the Adversary Modes in recent updates, constantly adding newer and newer game modes, each of which are becoming progressively more unique and less conventional. The design team is going all out on trying to mold the existing game mechanics into exciting new features which would typically be unconventional in a game of this genre. We recently saw the Slasher and Running Back modes being added which are more divergent, as well as a number of more traditional but still creative modes like Hunting Pack.