Just Cause 2 Multiplayer Update Open and in Beta Now
Just Cause 2's multiplayer is only going to get more chaotic though with the dev team's newest update which, according to the dev team, is the "biggest, baddest, most awesome" update yet. The update is promising scriptable NPC actors, civilian models, depth rendering, basic unicode support, a new main menu, and Steam Achievements.
The beta for the update is completely open and out right now, but you'll need to make sure your Steam account is opting into betas to get in. For instructions and a full list of changes check out the Just Cause forum here.