Nin10do also said that for the first time developers could max out with the hardware better than ever before thanks to their x86 architecture..
Which means there won't be no more bigger leaps within the upcoming generation...
In other words: Expect no huge graphical jumps like between Perfect Dark on 360 and Halo 4 for example...relating to the PS4 and Xbox One.
This architecture WAS NECESSARY to show at least a bit of a leap at the start of a new gen! But the time will catch them up soon as it's difficult to make better graphics than what you will see at the launch window/first year of those systems. So games like FF15 or Witcher 3 possibly could already almost push the envelope...
Let's wait how Naughty Dog, SCE Santa Monica or Quantic Dream will perform on the PS4.