Interesting
"Back when GTA IV was being shown to press, Rockstar representatives would stress the importance of the number in the title. As successful as Grand Theft Auto: Vice City and Grand Theft Auto: San Andreas were, they noted, it was the game that preceded them, GTA III that was a paradigm shift. They hoped and believed that GTA IV, by being a numbered game would have and merit some outsized influence of its own. If that is still the company's philosophy, then after Grand Theft Auto IV's un-numbered episodes, The Lost and Damned and The Ballad of Gay Tony, a numbered GTA V should again merit special attention. Shifting cities was not sufficient cause for a new numbered GTA before. A change to the series' formula, however, one that gives players more than one controllable character, would."
Maybe a hint that it will be a next-gen title?