One major selling point of the Assassin's Creed series is its open world, but Ubisoft is aiming broader for Assassin's Creed 4: Black Flag. The vast open ocean is available to you, with several islands dotting the landscape for your pillaging pleasure. A lengthy new walkthrough shows its various open mission types in progress.
The video is 13 minutes in all, and narrated by game director Ashraf Ismail. You get to see Edward take on some missions, pillage a ship for money, sing a sea shanty (yes seriously), and sail through a treacherous storm to another island. Check it out below.