Monolith Productions describes the game as a “single player open-world action game will introduce an original story set in the DC Universe and allow players to become Diana of Themyscira in the fight to unite her Amazon family and the humans from the modern world.”
It will be a third-person, open-world action game, and it will also feature the Nemesis System made popular in the Middle-earth games that lets you build connections with friends and foes in the game. However, we don’t know when the game might come out, or even a release window.