The post stated that while disc-based PS4 games will not be playable on the PS5 Digital Edition console, digital versions of compatible PS4 games that players have purchased or plan to purchase on the PlayStation Store or PlayStation mobile app will be compatible with PS5.
The CEO stated that Sony took into consideration that the PS4 currently has 100 million players, and directed resources toward adding backward compatibility of PS4 games to the PS5.
Sony Interactive Entertainment CEO Jim Ryan confirmed in an interview with Famitsu on September 18 that the PlayStation 5 console will not have backward compatibility for the PlayStation 1, PlayStation 2, and PlayStation 3 console games.
Both digital and physical versions of compatible PS4 games will be playable on PS5 with Ultra HD Blu-ray Disc drive.