The ever-vigilant MMO-Champion dug the adorable abomination embedded above out of the latest Cataclysm beta patch. It isn't quite as chin-tastic as the fan mock-up that was going around a few months ago, but it is still a righteous chin nonetheless.
There's a strong possibility that baby Deathwing will join The Burning Crusade's Netherwhelp and Wrath of the Lich King's Frost Wyrm Whelp as a collector's edition pet, but according to Boubouille, there is nothing that confirms or denies that in either direction. We might also see it as an instance or raid drop somewhere down the road, or it could come from any number of other places. The pet store, perhaps?