Just Cause 4 was officially revealed on the Microsoft stage at E3 2018. It will be released on PC, Xbox One, and PlayStation 4 on December 4, 2018 and is available for pre-order today.
Steam leaked Just Cause 4 earlier this month via a pre-purchase advertisement. The leak came a month after a major leak from Walmart Canada, which revealed Just Cause 4, Gears of War 5, Rage 2, Borderlands 3, and more.
Source: IGN.com Just Cause 4 Officially Revealed