5. Competitive Multiplayer: Gang Warfare
Multiplayer in GTA IV had been a favoured inclusion but I, and many others, couldnt help that it failed a little to hit its potential in persistence other than simply levelling up. This may be slightly ambitious, but the addition of a mode that gave you the option to join permanent gangs that fought over the full map of Los Santos could be out of this world... as it is out of this world. How this would be implemented so that it was continuous overtime would be a challenge, but maybe producing something slightly more involved than killing opposing players and/or AI in and instead assigning players a random mission to take an opposing place could well be interesting.