I Know they gave us three of them but lets "SPECULATE" on what the other four would be?..... my guess is that they will have...
1.) a kill the man with a ball type game.
2.) co-op mode where you do missions in co-op.
3.)a free roam type game where you and 6 friends just roam the city and do whatever you want like start beating up old ladies or just hold up one end of the city for as long as you can against the cops.. (make a car barricade and shoot anything that moves.)
4.)they might even do cops and robbers for a game? who knows
what do you think?