SCE San Diego Studio is developing a PlayStation 4 title, one of the studio's employees has revealed.
A reference to the developer's unannounced next-gen game appears on the LinkedIn profile of cinematics animator Jack Liu, which suggests that he's been working on the "Unannounced PS4 title" since March 2013.
Sony San Diego previously developed PlayStation Move series Sports Champions and games in the MLB franchise.
It also developed the PSP and PlayStation Vita versions of ModNation Racers, and downloadable title Pain.
Sony is expected to reveal more information on its PS4 line-up during E3 next month.