[Da Ill One]

To Quote Jo Nada from another site...

It doesn't have to be about being good or bad, but more along the lines of moral decisions like choosing to do a hit on some innocent random guy that owes some boss money or decide to take out the boss himself instead. Maybe it can also deal with how many people you run over, how many times you have cops on you, how many cops you kill. There are dozens of things like that they can keep track of and mold the game accordingly as you play without ruining the essence of what GTA is.

GTA4 actually had decisions like these, but they just barely affected various outcomes of the game so I'm guessing this would mean this system is more dynamic. Probably affecting what kinda contacts you have, what kinda missions you get, weapons, places to live, etc...