Rare's new game, Sea of Thieves (PC/Xbox One - 2016)

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Another trailer that shows very little, but Rare are describing this as the most ambitious game they've ever made. It's supposedly an MMO, but it also has single player. I'm not sure exactly how that's going to work, but a pirate-themed MMO sounds pretty good to me! It's out at the end of next year for Windows 10 and Xbox One.