Collector's Edition has not been shown yet, but every CE contains pretty much the same type of things. Although since they usually gave cards to the card game, which is now replaced by Hearthstone, I would have thought there would be some fun HS card in the Deluxe Edition, but apparently not.
Still, what goodie is your favorite in the package? Even if you don't buy CEs, which part would you want the most if you got one for free?