Black Flag is the fourth game in the Assassins Creed Series and will be available on PS3/4, XBox360/One, Wii U and Windows.

Assassin's Creed IV: Black Flag - Wikipedia, the free encyclopedia

E3 Official Gameplay Demo - Assassin's Creed 4 Black Flag [UK] - YouTube

Assassins Creed 4 Black Flag -- E3 2013 Trailer - YouTube