EDGE said that Sony was shooting for 8GB and everything else that they said about the PS4 was correct too. They had the controller and game recording correct. They also said that the PS4 will be significantly more powerful than the next Xbox. So far they have been correct on everything else
http://www.edge-online.com/news/playstation-4-revealed/
"Slightly", not "significantly":
One source familiar with both platforms tells us that in real terms Sonys console is slightly more powerful and very simple to work with.