Is Sony working on a PSP?

I'm curious to know if Sony is currently working on a successor to their popular PlayStation Portable, or PSP, as it's been several years since the last iteration was released. With the gaming industry constantly evolving and new technologies emerging, it would be intriguing to see if Sony has any plans to revitalize this handheld gaming platform. Could this potentially be a way for them to tap into a new market or cater to a different demographic of gamers? I'm eager to hear more about any potential projects or rumors surrounding a potential PSP successor.