I've seen some of the gameplay previews. I don't know how you make money, how many buildings you can run into, or if you can steal outfits off of people. However the graphics seem much better than it's predecessors. There your surroundings are more in depth and distinct (This is because Rockstar studied actually locations as a basis for their city construction). The NPCs AI seems to have been improved upon, ex. While running away from the police a cop runs towards your vehicle and then turns sideways to block your path. Also pedestrians have enough common sense to duck whilst being shot at. The aiming of has been improved a LOT. Also there seems that there are actually decent rag doll physics implied in the game. The game isn't extremely realistic compared to other games, but GTA wouldn't be fun at all if it was. There are other subtle nice touches that were added like after you are shot, sometimes blood hits the camera.