https://www.gamespot.com/articles/skull-and-bones-pre-order-guide-us/1100-6459506/

Set sail on the Indian Ocean, a frontier region that's rife with riches. It's also a battleground between pirates, trading corporations, and colonial forces. This is Skull & Bones, an upcoming shared-world game that has you assemble a crew and engage in various modes of naval combat. It's expected in 2019.

We got our first look at Skull & Bones at Ubisoft's E3 2018 conference in a new cinematic trailer. As the name implies, it's a naval battle centered title, where you can ally with your friends or fight against them, and it's incredibly reminiscent of Assassin's Creed IV: Black Flag. There will be plenty of customization options for your ship, and different ways to take on missions--guns blazing or slowly and stealthily. The name of the game is piracy, and you're seeking to be the greatest pirate in the Indian Ocean.