Coming late to the party:
I've had the special edition set for a few months and here are my thoughts:
#1) There is nothing of interest on the second disc at all
#2) As pointed out, the artwork is terrible (go see the original movie poster...)
#3) Yea! Not formatted to fit my TV!
#4) Sort of odd commentary. Interesting comments about the animation itself, backgrounds and use of colors. I'd hoped to hear more about the creative decisions made to radically alter the plot--and this is touched on a little bit, but I would have liked to hear more.
My final take on this one is if you really enjoy the film, the second purchase is probably worth it, but don't expect to be getting something well out there beyond the original dvd release. This is not a very wide 'widescreen', and the commentary is only of interest to a few.