The new Assassin's Creed 4 DLC to the game, Freedom Cry is going to include new locations but also hints to a continuement to the storyline which could be, as speculated, AC5. Ubisoft has informed the public though that it will sadly not include a kraken, despite the DLC's developer Ubisoft Quebec initially considering the idea.
Freedom Cry focuses on first mate-turned-assassin Adéwalé, 15 years after the main game takes place. The storyline also goes back into the main AC4 lines by showing at least one previously-seen character and a "notable object", as creative director Wesley Pincombe explained. The add-on moves the action to Port-au-Prince, capital of modern day Haiti, which is an entirely new location for the game.