Here's a little bit of unexpected news for you. Contrary to popular belief, not everyone in Japan already owns a PS2. You might think that with the PS3 out, that the Japanese would be more concerned with the latest games, however there must still be a demand for the 8-year old console. Why else would Sony decide to launch a new version of the console?
There actually doesn't appear to be much different about the outdated console aside from the new paint job. I'm not really sure why they're releasing a new color for an outdated console. Sure, you'll get plenty of life out of your old PS2, but is there really enough demand to justify an extra SKU?
I'm curious if this will prompt other companies to re-release consoles in fancy new colors. Perhaps we'll see a yellow Xbox and a tie-dye Game Cube in the future.