Monk - enchanted tiger
Warlock - demon Horse
Hunter - wolf/wyvern creature
Mage - flying disk
Warrior - proto drake
Rogue - raven
Priest - snowy owl / cat hybrid
Shaman - air elemental
Demon Hunter - demon
Death Knight - undead dragon
Druid - large owl flight form
Video
https://www.youtube.com/watch?v=nIES9_B_39wImages can be found on both wowhead/mmo champ