Sony has filed a patent that looks like cloud-based backwards compatibility system to support PS1, PS2 and PS3 titles on the PS5.
The patent’s description reads:
Another trend growing in this industry relates to the development of cloud-based gaming systems. Such a system may include a remote processing server that is configured to execute a game application, receive input from a user and communicate with a local thin client configured to display an image on a display.
Filed on July 2, the patent contains model illustrations of the PS1, PS2 and PS3 and is accompanied by this description:
An accumulation of game titles across various generations of a gaming console in accordance with an embodiment of the present invention.
PS5 will support backwards compatibility for some, but not all, PS4 games. The top 100 PS4 games will be supported according to Sony, as will new PS4 games certified after July 2020.