Sony wants to get PS4 out by around 2012, if not sooner which makes a mockery of its claims that PS3 would be the focus of attention for ten years after its release. A smaller machine would certainly help in the Japanese market (smaller consoles sell better there).
http://playstationlive.blogspot.com/2009/05/is-ps4-now-in-development.html
I don't even care anymore....








