Version 1.1 is a free update* for all Ghost of Tsushima players. This update brings the launch of Ghost of Tsushima: Legends, a brand new co-op multiplayer mode inspired by Japanese mythology, as well as exciting new updates and New Game+ for the single-player campaign.
Version 1.1. will be available on October 16, 2020.
*Internet and PlayStation®Plus required to download/play Legends Mode. PS Plus is a paid-for ongoing subscription with a recurring fee charged automatically at the frequency chosen by the consumer at purchase until cancelled.
Source: Playstation YouTube