During Microsoft's E3 2015 press event, the company announced the next game from UK-based developer Rare. It's called Sea of Thieves, and as the title suggests it's a pirate based game.
The trailer for the game confirmed that it will be released for Xbox One and Windows 10. Based on the video, it appears that it is an online-only game, where players will be able to interact with other folks as they explore islands, fight monsters like skeleton pirates and even battle on the ocean in big sea cannon battles. No release date for Sea of Thieves was announced.