According to a report by MP1ST, Sony Interactive Entertainment is planning to release a remastered version of Horizon Zero Dawn for PlayStation 5. This version will have improved visuals throughout the game, bringing it up to the same level with its sequel Horizon Forbidden West.
Besides the visual improvements, there will be some accessibility features, graphics modes and quality of life improvements for the gameplay in this remastered version of Horizon Zero Dawn. This is not really a surprise considering that recent years saw a large amount of remastered games coming especially from Sony.
There are also some future plans for multiplayer games for the Horizon series, which was initially thought for the Horizon Forbidden West. Guerilla Games decided to save this feature for future games, intending to build a good co-op game.