Seeing as how Blizzard is toying with the idea of Tri-Spec (hence the data mining), I don't think it's so far fetched to think that we might be getting a 4 spec for every class in the new expansion. I tell you what, it would be a hell of a lot more interesting than just getting 1 or two new abilities when we level up to new cap. Here are some ideas for each class for a 4th spec. I need a little help though it's kinda hard coming for seeing as how I'm not a Lore enthusiast.
Death Knight - Healer - (Really cool concept blog linked) http://www.mmo-champion.com/threads/...ay-a-DK-Healer
Druid - ?
Hunter - Shadow/Demon Spec
Mage - Battlemage
Monk - ?
Paladin - ?
Priest - ?
Rogue - Field Medic Healer
Shaman - Enhacement Tank
Warlock - Demon Form Tank
Warrior - ?