Sucker Punch Productions just announced a new online, co-op mode for Ghost of Tsushima. It is called Ghost of Tsushima: Legends, and will come with four unique character classes, a host of missions, and a survival mode. The game mode is multiplayer-only and will be available for everyone who owns the base game.
https://www.notebookcheck.net/Ghost-of-Tsushima-Legends-coming-this-fall-will-feature-new-online-co-op-missions-game-modes-and-more.487976.0.html