Two adapting beasts revealed
Hearthstone card design Dean "Iksar" Ayala posted an article on Hearthstonetopdecks.com on the development of the adapt mechanic. Here he also took the time to show off 2 new cards.
Lightinfused Stegodon is the natural adaptation to be present in the paladin class. Always getting new ways to spawn Silver Hand recruits, it would only be natural that Paladins could adapt them aswell.
I do have my doubts on whether this is actually good enough, though. Steward of Darkshire is a 3 mana 3/3 that gives all recruits, spawned (alongside any other 1-heath minions) divine shield, something worth a full adapt and it sees no play. Whether this will see play will depend on how strong it is to be able to apply the effect on existing recruits, whereas Steward only works on new recruits spawned.
These guys date back to Warcraft 3. Thunder lizards roam most parts of Kalimdor but whether they will be roaming decks in the Un'Goro meta is unlikely. The statline is mediocre and because it is not an elemental itself, it breaks the "elemental chain". It does so in a rather crucial manaslot too right before the much stronger Tol'vir Stoneshaper. In doing so it potentially opens up elemental decks to aggro deck, usually a bad idea.
Sorry, Thunder Lizards, maybe if WC3 Remastered comes around but Hearthstone will probably not be for you.