There have been rumors concerning a new PlayStation and although it's all speculation, one thing is certain: Sony has started work on "future platform-related activities."
In a recent Develop interview with Sony Worldwide Studios head Shuhei Yoshida, we learn that Sony is looking to the future with the help of its first-party developers. This change in focus concerning how new hardware was created came about after the departure of Ken Kutaragi, and the arrival of Kaz Hirai as president of SCE. The latter wanted developers in on any new hardware-related meetings, which is probably a good idea. As for new platforms, Shuhei said:
"Yes, we are undergoing many activities that we haven’t yet been talking about in public. Some future platform related activities."
Later in the interview, Yoshida goes on to say how SCE "underwent a rescue mission for its first-party studios, bringing together top engineers from around the world to build a universal game engine." As of now, it's Yoshida's major role to "connect hardware guys to developers." Well, we're certainly on board with that philosophy and you shouldn't worry about the PS4 popping up early; you had to assume Sony would be at least talking about the next platform by now, right?