Hearthpwn

Artwork of possible cards from the Un'Goro trailer:
The turtle is showed as a 8 mana minion (we don't see any stats)
The plant seems to be a 3 mana 4/8. (new Shaman card? Kappa)
The Murloc is a 2 mana 2/3. 
The Rock Elemental also seems to be a 2 mana 2/3. 
The Wasp is 3 mana (again, we don't see any stats)
 - Note that there's often a few cards in Blizzards trailers that doesn't make it into the game. 

        

Quote from SnowWhiteOo >>

Quote from tictactucroc >>

- Note that there's often a few cards in Blizzards trailers that doesn't make it into the game. 

It happened once in TGT that's it. It's very likely all these artworks are actual cards or tokens.

As i remember correctly the cards Romeo and Julia from the Karazan Adventure were also shown in the trailer and didnt make it into the game. (of course as playable cards)