Edge rumorish thing
http://thesilentchief.com/2012/07/04/ps4-360-will-need-plenty-of-ram-to-meet-square-enixs-standard/
Seems more support for 8GB, as well as the 3GB for OS rumor.
Hadn't heard the rumour about 3GB reserved for the OS. That is huge, I mean that is far more than you have for the OS on PCs. I can understand you might want to futureproof a bit. It is difficult to tell developers that 7GB are your to use and 1 GB for OS and then a few years later you realize that you need more for the OS, but still 3GB? Would it be for really fast app switching? You basically have all your apps loaded in RAM all the time or something. Would that 3GB then include kinect as well? We will find out I guess...