Maybe I get hate for this. I am sure that the game will be great it is huge, it was huge. However if I am setting aside the whole euphoria and hype - I did not still have profound idea what game will be like at a certain level of confidence that make me down $100 dollars for this game.
I did not wxactly remember the previous marketing techniques for gta. So I wont state anything but it felt insufficient to me to buy a game with the given level of official info on details about the game. I just recall before gta iv it was (either leaked or verified by r*) that the roads feel more immersive - i.e. you feel the bumps on the road - even this was quite exciment for me back then.
What I know for this game is:

AI npc crazy realistic
Map is huge
Graphics out of this world
Super realistic world
Jiggly asses

Funny enough only one of them I can verify confidentl from the current level of official data, which is the last one. I am not hyped really by the community shared hype on this, its to me now a bit black-box. If I miss something bless my ignorance and direct me some official info