I preordered the disk. Wind Waker was really awesome at showing what the gamecube was capable of, and the fact that it can still look modern is a testament to it's art style.
Its not just the art style. Windwaker was one of the most technically advanced games of its generation. AND it had an art style from a team simply beyond what other studios had.
Windwaker featured:
Tesselation The gamecube actually had a hardware tesselator. Yes. The game cube. So did the wii, and so does the 3ds and wii u. WW was one of if not the only cube game to use it. WW used it for the interaction animation between the boat and the sea, and sails.
Advanced per pixel shading (with, somehow, almost obsolete fixed function pipelines). There is a reason its called cell shading. Flippers fixed function shader routine was utilized fantastically. So well did the technology and art style mix, that some people are actually put off by wwhd's switch to a modern deferred lighting engine.
Open world streaming and (then) advanced lod.
Environment mapped bump mapping. Used primarily for heat distortion effects.
Advanced physics. Ww had a fantastic and detailed physics animation engine. It even reacted to wind, cloth physics reacted aproppriately to (most, there is some approximation at work) surfaces, such as the streamers on the spears dragging, laying appropriately on the ground. And had the classic physics weight puzzles looooong before half life ii.