In article dth,
Doug Jacobs wrote:

That's a pretty big "if", if you ask me. Other than making sure the
majority of next-gen games are 1080p @ 30fps or better, I don't really see
what more can be done in the graphics area except - maybe - 3D support.
Right now 3D support is experimental, and no standard has emerged. Yet.
If that changes and the PS4 was the first/only console to support 3D
grahpics for games, that would be a huge win for Sony.

Better shaders, more AA, more filtering, better HDR.

Don't be surprised if they render at 720p and use upscaling to use more
lighting effects than using a higher resolution.