https://www.pushsquare.com/news/2019/09/sunset_overdrive_is_owned_by_playstation_sony_confirmsSpeaking with Japanese publication Inside Games, the ever-affable Shuhei Yoshida has confirmed that the Japanese giant does now own the Microsoft published title. "SIE holds the rights to past Insomniac Games works," he admitted. So what are the chances of a port, then? "I am looking forward to future titles."
I guess SO is truly dead then. Can't see Sony doing anything else with the IP other than a port.