I have to admit I am surprised to see that some actual work is going into the GTA Multiplayer. I was expecting Deathmatch and maybe the Co-op from San Andreas but Rockstar has gone over the top, as they usually do, and given us 15 different ways to tear up Liberty City:

1. Deathmatch

2. Team Deathmatch

3. Hangman's NOOSE

4. Mafiya Work 

5. Team Mafiya Work

6. Cops N Crooks

7. Race

8. GTA Race

9. Car Jack City

10. Bomb Da Base

11. Bomb Da Base II

 12. Turf War

13. Deal Break

14. Free Mode

15. To be announced

Death match and Team Death Match will give the host complete control over weapons, how many pedestrians and whether or not the cops will come in. In GTA Race you can destroy other players cars and car jack vehicles. Cops N Crooks plays out like cops and robbers where one team plays the crooks and the other the cops trying to get said crooks. Mafiya work has you completing objectives and Free Mode is probably just what it sounds like. Players will be able to customize their characters in online play. With all these game modes it looks like GTA will once again consume my soul.

Source