Ubisoft has announced a new game that will allow you to play as pirates called Skull & Bones. It will have an expanded naval combat system as seen in some Assassin’s Creed games.
Ubisoft actually admitted that the navy stuff in Assassin’s Creed IV inspired the development for Skull & Bones. The game will be out in Fall 2018 for PC, PS4 and Xbox One.
The game will have a heavy focus on multiplayer as 5v5 battles can take place. There will be a beta for the game sometime in the future. You can look at the trailer below for more details.