People may want to check this out:

http://gamesblog.ugo.com/index.php/gamesblog/more/grand_theft_auto_4_the_lost_and_the_damned_multiplayer_preview/

The text below is edited from article on site.

Witness Protection
One of the cops is in a bus and must drive to random spots in the city to drop off government witnesses, while the other cops drive alongside the truck and provide defense against the bikers. The bikers are just trying to blow up the bus or kill the witnesses as they get out.

Race
Racing on bikes, with baseball bats.  Plays out a bit like Road Rash.

Lone Wolf Biker
Kill the Carrier but everyone has bikes.

Own the City
Sections of the city are divided up and you must control them by taking out all the AI soldiers in that area. Once they’re taken out friend AI’s will populate and try to defend against the enemy team.

Club Business
A lot like Mafia, but with club leaders and more tasks.

Chopper vs. Chopper
1 on 1, with someone on a bike and someone else in an attack helicopter. The biker is just trying to survive through X number of checkpoints (or time) while the helicopter pilot is trying to kill the biker.

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Out of all the multiplayer modes, Witness protection felt like the most fun to me. While Chopper vs Chopper felt like the least amount of fun. Chopper vs Chopper felt imbalanced to those who know how to fly a helicopter right, and those who didn't. Simply enjoyed crashing the helicopter into me. Wasn't too much fun really.

However Witness Protection was in my opinion amazing, With proper teamwork and coordination. It was a ton of fun and really intense when your the bus. Here's a video of it just to see what I'm talking about.

One mode that would be cool to implement formally (I did it informally) was a "siege" mode. In this one team holds itself up in a gas station or some store, and the authorities come in and try to take them down. Object is to stay alive as long as possible. The team under siege has limited ammo and has to recover that which the law enforcement brings in. Eventually NOOSE equipment does come in also.