thuway assured us that it would not over 4GB. In contrast to GopherD, who apparently had better info. As did a junior poster, Shayan, as did whoever leaked their info to Edge. It doesn't matter if it was a last minute change developers didn't see coming -- all that means is that his "source" isn't good enough to warrant top-level hardware specifications speculation.
The one reason I still take into account what he has to say because another much liked source, BruceLeeRoy also assured us that we would not be getting more than 4GB. Given, that some of Sony's own and quite a few third party studios were dumbfounded, it is not hard imagine just how tightly the lid must have been kept on it. I still remember the EDGE article that stated Sony was trying to match MS' 8GB offering and that became a topic open to interpretation.
As for GopherD, I do not remember him saying anything pertaining to 8GB RAM figure (can you kindly relay what he had said?). As for Shayan, it is hard to trust a junior who acts like a fanboy, writes like he has some untold authority, comes off as highly pretentious and is rude as fuck.
But none of the members who get their info through someone else can be relied upon 100%. That said, GopherD's situation eludes me. I am not sure if he has a source or he is one. Lherre for instance is a developer and as such he rarely discloses information. He is a rare first hand source.