https://blog.us.playstation.com/ ... re-technical-specs/
Lastly, we’re excited to confirm that the backwards compatibility features are working well. We recently took a look at the top 100 PS4 titles as ranked by play time, and we’re expecting almost all of them to be playable at launch on PS5. With more than 4000 games published on PS4, we will continue the testing process and expand backwards compatibility coverage over time.

说的很含糊，到底是100款列表里的游戏支持Boost Mode还是支持Legacy Mode，屎一样的PR。