This is the topic where you can discuss any aspects of the sequel to the best game ever, IMO. It comes out on December 3rd, for PC and XBox. PC users beware, though, you're going to need a VERY powerful computer to run it.
I'll try and put it simply, without spoilers:
You're JC Denton, a Nano-Augmented agent for UNATCO, the United Nations Anti-Terrorist Coalition. Your enemy is the NSF, a large band of terrorsts who must be exterminated. They have already commited such crimes as bombing the Statue of Liberty, and must be stopped. As you go on into the game, new ideas and information is revealed, causing you to question who is right and who is wrong. After finding out your brother, Paul, has joined sides with the NSF and left UNATCO, you decide to find out why. Suddenly, all hell breaks loose, and you don't know who is your foe and who is your friend. As the game goes on, you unravel secrets involving a deadly conspiracy, and you must choose how you intend to put a stop to it. Your choices will affect the fate of the entire world in many different ways...
Yeah, and that's extremely brief. But it gives you a rough idea. Plus, in what other game can you have heated philosophical debates with unrealisticly intelligent barkeepers in a Hong Kong nightclub?