President of Sony Worldwide Studios Shuhei Yoshida has confirmed that all 12 of Sony's first-party studios is working on a PS4 title.
When asked by IGN whether it is "fair to say" that all Sony-owned studios are working on a next-gen title, Yoshida answered in the affirmative.
"Is it fair or not fair? It is fair to say," Yoshida responded.
While it was confirmed last week that Media Molecule, Sucker Punch, Guerrilla Games and Evolution Studio have confirmed games in the offing, Yoshida's comments suggest that the likes of Naughty Dog and Polyphony Digital have unannounced next-gen works in progress.
Sony has amended the list of studios that will develop for the PS4.