Official Information about GTA V
These two sources provide the only known information about the game:
The game is set in modern-day Los Santos (based on Los Angeles) and surrounding countryside in the state of San Andreas.
The cities of San Fierro or Las Venturas (the other cities in San Andreas) are NOT included in GTA V.
Los Santos and the surrounding areas have been completely remade; it is not a copy of the map from GTA San Andreas.
Named locations include: Vinewood, Little Seoul, Los Puerta Freeway, Vespucci Beach, Downtown, Del Perro Freeway, East Los Santos and Los Santos Bay.
GTA V will include: female police officers, dogs, planes, airships/blimps, trucks, jet-skis, mountainous countryside, convertible cars, mines and wind turbines.
The city and surrounding areas appear to be thick with smog during late evening time.
Many vehicles have returned from GTA IV, with some being redesigned, and many new ones have been created.
The U.S. Interstate will be featured in the game, making it one of the few things not to be parodied and have its real-life form in a GTA game. This does not confirm that San Fierro, Las Venturas or any new cities will be in the game.
källa:
http://www.grandtheftwiki.com/Grand_Theft_Auto_V#cite_note-0