Persona5 Royal contains a lot of DLC, 45 to be exact. Atlus confirmed that they would all be included in the Windows version of the game.
Not the Steam version, but only the Xbox and Windows versions of the ports are mentioned in the news. This could mean that the offer is unavailable to those with Game Pass or the Microsoft Store. Atlus may use Windows as a generic term, and the Steam version will receive the same treatment.
Many DLC options are available for the game, including costume packs, BGM packs, and different personas. In a challenge mode, you can also face off against Persona 3 or Persona 4’s protagonists. Some item packs will give your phantom theft a boost. The complete list of Persona 5 Royal DLC can be found on the Persona website.
Persona 5 Royal will launch on Game Pass for PC, Steam, and Xbox One on October 21st. Persona 3 Portable will follow at a later time. Persona 5 Royal launches on Game Pass for PC and Steam on October 21st, with Persona 3 Portable set to arrive later.