This is what I think would look cool in the next installment of GTA:

Title: GTA 4
Year: 2003
City: Las Vegas
Cars: As long as they're fast, look good, and have good handling I dont care.
Gangs: American Mafia, Russian Mafia, Triads, etc.
Weapons: Same as GTA: VC, and maybe a fiber wire like in Hitman 2.
Items: Cell Phone, Lockpick.
Additional Info: More buisnesses to buy, such as casinos, clubs, golf courses,
etc. Also, I think the game would be better if you could hang off of ledges and swim.