Rockstar announced yesterday their reason behind pushing back the long awaited release of the newest GTA.
There has been much speculation behind the reason, whether it has been to coincide with a console release or Rockstar is being paid. Whatever the rumor you believe the official story is so that this new GTA will be the best it can be. However the official statement did not deny that it will line up with a console launch.
As of right now the official release date of GTA V is September 17th, 2013.