Whatever the PS4 looks like, the final question to be asked is: when will it launch? Sony's Kaz Hirai has already given us a hint: "If you look at the history of the way we've managed our console business," he said, "we always try to hit a 10-year life cycle "

That might put any PS4 launch back to 2016. But when you consider that the PS2 is still chugging along in the shadow of the PS3, a PS4 could easily sit alongside and overlap the existence of the PS3.