A number of Sony's first party studios are working on PlayStation 4 games, according to respected industry site Develop.
"A trusted source connected to the matter" told the site that several of Sony's 16 internal studios have stated work on PS4 game concepts that could enter into full production if given the green light.
The site claims Sony has yet to finalise the console's technical specifications and that the PS3 successor isn't expected to launch before 2014.