Amazon Japan listing shared by @Wario64 has revealed that Call of Duty: Modern Warfare Remastered could become available separately starting June 20 on PlayStation 4.
The Amazon Japan website has a different listing for the Xbox One version with a July 20 release date, which could mean PlayStation 4 will get Modern Warfare Remastered separately 30 days early.
The June 20 release date was first revealed by US retailer GameFly, which posted the same dates on their website earlier this year for PS4 and Xbox One versions. Late last month, two German retailers also listed Call of Duty: Modern Warfare Remastered release on their websites for June 23, but those listing have since been removed.
Activision has not stated yet when or if Modern Warfare Remastered will be available separately.