The latest Black Flag video is narrated by lead character Edward Kenway, who talks about the pirate way of life.
The trailer also teases multiple gaming environments, from lush jungle temples to occupied cities. Kenway is also seen assassinating targets and boarding rival ships.
Confirmed earlier this year, Assassin's Creed 4 will be set in the Caribbean in 1715, with players taking control of Edward Kenway, the grandfather of Assassin's Creed 3 protagonist Connor Kenway.
Said to be the biggest Assassin's Creed game yet, it will feature 50 unique locations including the cities of Havana, Kingston and Nassau, as well as fishing villages, smugglers' coves, plantations and jungles.
With Desmond's story concluded, the player themselves will assume the hero in the present day setting, working for Abstergo and researching Kenway's backstory.
Assassin's Creed 4: Black Flag will release on November 1 in Europe and October 29 in North America on Xbox 360, PC, Wii U, the PS3 and PS4.
> Our extensive first-look preview of Assassin's Creed 4: Black Flag
Watch the Assassin's Creed 4: Black Flag announcement trailer below: