Ubisoft announced via the Sony press conference at Gamescom that Far Cry 4 will allow players to invite players who have not bought the game to play the Co-Op version of the game. This is possible through the Keys to Kyrat feature, exclusive to PlayStation.
With Keys to Kyrat, players will be able to send up to 10 invite keys to friends via PSN to play up to two hours of gameplay. Here, you can take on enemies and capture outposts for the duration of the trail period.
Far Cry 4 is coming out on the 18th of November in North America, and the 20th of November in Europe, and the 21st of November in the UK for PC, PlayStation 3, PlayStation 4, Xbox 360 and Xbox One.