User blog comment:DeltaWolf247/GTA V Map Confirmed/@comment-6680085-20130910191852/@comment-5376144-20130913012003

Brady Games has a ruined background for strategy informing, most of their information of Grand Theft Auto IV has been proven to be wrong, and I believe R* would not hae spoiled the map this way, so it was probably leaked by an employee or stolen. Also, R* listed that the official release date will be on September 17th, at 4:00 PM.