I have a feeling people's dreams of robbing one another and bombing one another might be not as easy as planned. I think they've mentioned that there are events for going up against each other. In other words, I think it's more of a PVE environment, rather than PVP. I'd like to team up with friends and go up against other teams, but something like a PK system could ruin the fun. I do think there is some control over that. I can see someone just following someone around and harassing them constantly, which I know Rockstar won't approve of.
Anyways, I don't have a goal. Just learning the online system and finding a good solid team sounds pretty cool. I'm more interested in the team events to enjoy with friends/teammates rather than go out and just battle other teams. Don't get me wrong, there is a time and a place for that and I'm down with it. I think team missions sounds the most fun. Make your own "Heat" movie moment, you know?