While the PS4 hasn’t officially been announced yet, it appears that hasn’t stopped game studios from starting work on next gen releases. According to sources, several games are entering the early stages of development already.
The first to start working on games, according to Develop, are Sony’s in-house production teams. This would make sense, as third-party studios would probably just be guessing at this point. Despite the start on game development, it’s not believed that a new system will see the light of day until 2013 at the earliest. Probably a good idea for Sony to get a head start though and hopefully have launch titles that don’t suck.