De una noticia en IGN sobre el online
For starters, over 500 missions will be available in GTA Online when it launches, some of which can be completed solo while others will require you to team up. All of them take prior to the start of the single-player game, meaning some familiar faces will make an appearance. If you make friends with the right people you'll also be granted bonuses (for example, biker gangs may offer mission support or a hacker can hide you on the radar in multiplayer matches).
http://www.ign.com/articles/2013/09/11/grand-theft-auto-online-details-revealed
y otro articulo con muchas cosas repetidas y algunas nuevas que molan mucho xd