https://www.gamespot.com/articles/monster-hunter-worlds-ps4-exclusive-horizon-dlc-av/1100-6456339/

Monster Hunter World launches for PS4 and Xbox One in just one more day, but PS4 players will have some additional content right from the outset. On the official Japanese Monster Hunter World website, Capcom confirmed that the first quest to get the PS4-exclusive Horizon Zero Dawn armor will be available at launch, but it won't be around for very long.

Beginning tomorrow, January 26, PS4 players will be able to embark on the first part of the Horizon Zero Dawn event quest. You'll need to attain a Hunter Rank of 6 or higher in order to accept the quest, which has you hunting eight Barnos. After completing the mission, you'll obtain materials that can be forged into Horizon-themed armor for your Palico companion.