A lot of people are assuming this uses PSP's emulator on the PS4 (https://arstechnica.com/gaming/2018...l-usable-psp-emulator-hidden-in-ps4s-parappa/). If so this opens to a lot of potential PSP to PS4 ports (or even PSone to PS4 ports). What would you like to see on the PS4?
I vote for the Suikoden I and II Collection by Konami. There's an actual PSP port but was never localized. Also had wide screen support.
Edit: Damn "would like to look into"