Guerrilla Games released Horizon Forbidden West over a year ago on February 18, 2022, for PlayStation 4 and PlayStation 5. A new rating for the game suggests there will be a new edition of it coming in the near future.
The Horizon Forbidden West Complete Edition was found rated in Singapore showing the platform for this edition is for PlayStation 5.
What does a Complete Edition mean? This would mean that post-launch content like Burning Shores that recently released for the game would become available in this version. Sony Interactive Entertainment has not announced anything publicly yet, but it could be soon since this is a perfect Holiday product to sell this year.
Source: Reddit