The standard next gen game's graphics won't be vastly superior to the best of today.

[Kyuubi Ricky SSJ2]

I don't think there'll be any more big graphical jumps like the ones from gen 4 to gen 5 or gen 5 to gen 6. If you look at the best looking games from gen 6 they can easily stand up against most of the standard looking games this gen. We're quickly arriving to the point where graphical improvements will seem minimal between gens.