this DEMO isnt really about the PS4, this demo came out last year way before any talks of the Next Gen Consoles, this is a DEMO of Square Enix's new Game Engine to be used in upcoming Games it will be bringing to whatever Sony finally decides to call the PS4
the truth is there is still NO FINAL HARDWARE to the PS4, only the Orbis Developer Units exist and everything is probably still subject to changes, if you missed GDC 2013 the only thing Sony had to show was the Dual Shock 4 and the new "Kinect-like" Playstation Eye, still no PS4
the Sony PS4 reveal demos were possibly NOT RUN on the PS4 and its Hardware...
Dated June 7, 2012
http://kotaku.com/5916499/square-enix-ceo-talk-about-luminous-studio-engine