You should definetly upgrade! the DVD has One hour in wonderland tv show with walt disney, Alice comedy from the 30s, deleted scenes with katherine beaumont, tv shows, trailers, intros by walt disney and more. :D
the news was taken from Ultimatedisney.com. HD-DVD will be back compatible with present DVDs so if you dont have to buy new dvds unless you want the movie in high definition. of course tvs will be highdefinition by then. :)
As of right now, the next Treasures for December, 2003 are
"Mickey Mouse in Living Color - Part 2"
"Disney: The Wartime Years" (including "Victory Through Air Power)
"The Chronological Donald"