Nicalis recently provided a side-by-side comparison of both the old and new artwork to show these subtle differences. They blew the artwork of Toroko up 800 times to show these changes pixel by pixel. You can take a look at the picture below to see the differences for yourself.
So what do you think of the differences? Are they good or should Daisuke Amaya, or Pixel as he's known to many of his fans, have stayed with the classic artwork? We'd love to hear from everyone on the subject. Even those who are wondering why in the world people are actually getting up in arms over something this trivial.
EDIT: Nicalis has clarified that there will be an option in the game to switch between "classic" and "modern" graphic styles.