Notably the only upcoming PS2 game to feature magical wolves, aggressive painting and beautiful cel-shaded surroundings, Okami has come a long way since its original inception. Dubbed Ohkami, the early version presents quite a different experience to the one currently preparing to hit US shores. A comparison clip over at GameVideos (embedded in the second part of the post) puts the more realistic art style of the old version in stark contrast to the cel-shaded update.
It seems that the PS2 was simply not deemed powerful enough to render Clover Studios' original vision and so the shift was made to a different and more feasible art style. It's interesting that the decision marks one of the few occasions where technical limitations actually (and arguably) lead to a more visually striking game. If you had a choice in the matter, would you rather have the realistic (erm, as far as magical wolves go) Okami or the cel-shaded one? Comments from the "Zelda more like Celda" crowd are welcomed, of course.