https://www.gamespot.com/articles/alas-sea-of-thieves-will-not-have-pirates-of-the-c/1100-6456793/

Sea of Thieves is one of the most anticipated games of 2018, and it aims to deliver players an open-world, swashbuckling pirate experience. However, the game will sadly not feature a tie-in to one of the most well-known pirate franchises.

In response to a fan's question, developer Rare confirmed today that there won't be Pirates of the Caribbean DLC coming to Sea of Thieves. As a result, you won't be meeting eccentric captain Jack Sparrow on the high seas in the game.