Okay, it's no secret that Sony has been working on the PlayStation 4 for a good two years now and rumours abound that Sony will bring forward its launch to 2011/2012 to directly take on Microsoft's proposed launch of its next Xbox. All this talk of will it, won't it? or 'will PlayStation 3 be Sony's last PlayStation?' are largely irrelevant. It's happening, the real question is: what form will the console take? What follows is a list of possible functions ...