Not only do I personally prefer the original look of Chris Sander's "American Dog" which "Bolt" evolved from,
http://characterdesign.blogspot.com/2008/06/disneys-bolt.html
but the pigeons that appear in the trailer instantly reminded me of Warner Bros' Good Feathers characters that appeared in "Animaniacs".
I will give kudos to their hamster which seems like a fun character to watch, but there doesn't seem very much else that is "original". I guess only time and box office receipts will tell if this is a classic...