Players will step into the shoes of T-Bone, a character introduced in the main Watch_Dogs campaign. In 10 new missions that take place after the Watch_Dogs campaign, players will infiltrate Blume to plant a false trail in their system. Before he can escape, good guy T-Bone agrees to help a former colleague, Tobias Frewer. 

The PC specs don't have any big surprises aside from needing 25GB available on your hard drive. Take a look at the full recommended specs for yourself:

Way back at E3, Ubisoft unveiled some Watch_Dog co-op gameplay involving a second screen.  Anyone who has the Watch_Dogs app on their device of choice (tablet, phone, etc) can participate at the touch of a button. While Aiden Pearce (the main character) is a talented hacker capable of eluding persuit, even he runs into trouble every now and then. Anyone who has the Watch_Dogs app on their device of choice can participate in co-op madness. When Mr. Pearce finds himself in over his head, he can summon one of your real life buddies to his aid. While you attempt to evade capture by police or criminals your friend can assist by hacking into previously un-hackable doors, changing street lights to create traffic, or even taking virtual possession of a police helicopter, and flying it into the opposite direction. Player two can even crack into a news broadcast to deliver some well-earned snark for saving your bacon.