Kotaku recently posted an article about multiplayer on Grand Theft Auto IV. Here’s a brief description of what to look forward to:
All but one of the multiplayer modes supports up to 16 players. (The co-op missions only support up to four.) The host has an amazing array of options that they can control. While setting up a game, the host can choose to modify the routine, like re-spawn times, weapon selections and friendly fire, or the unusual, like the time of day, the weather, how heavy the traffic is or how many people are on the street. You can even control police presence in your matches.