Multiplayer will be more like single-player.
Activities will be all open, and also there will be missions like in single-player, although they will be their own unique story heists set up for people to team up and take down.
Some missions, players will be split up and each person has their different roles to play in the set-up, when certain missions go down, you will be competing with other crews who are working on their own agenda.
Also some players will be able to choose to play as cops like in GTA IV, and they have to stop the heists and gang wars and various missions from happening.
You will also have your own gang-hideouts, which other players will try to take over whenever they want, and you will have to defend them, a bit like turf wars.
Other modes like ‘Mafiya Wars’ will also be fully integrated in to the free roam, where players can choose to compete or just not bother.. there will be ‘Land Grab’ and ‘Most Wanted’ type features similar to Red Dead Redemption but expanded.