Hearthpwn

My deck predictions: (won't talk about the cards itself)

Druid: Slower ramp druid approach which will use Aviana and Joust cards and no low level minions (just spells).. This will probably be kind of viable and end up being the normal ramp druid (after kicking out a lot of the new cards again, especially the joust ones)
Beast druid will also be a deck I think but I forsee it as beeing a Tier3 deck.. Beasts + hero power centered deck

Mage: Has potential to get a inspire centered deck but probably it will just take some new cards and put it in the old decks

Warrior: New controll warrior approach with the new warrior legendary. (probably with bash instead of shield block to survive the early game since cruel taskmaster might be kicked out).. could be very strong
Taunt warrior: Think this will also be tried out and will probably be as viable as taunt druid. (not bad but also not top tier)

Shaman: Midrange Shaman with some totem synergy (but not centered around it).. maybe using the new legendary too. I think this will be a top tier deck
Slow, spell orirented Shaman deck.. People will surely try this one too and it may even work. This deck could use Joust kind of consistently and stabilize with the new Shaman heal. Curious to see this one.

Warlock: Can't see new decks.. I think Warlock will also only get minor improvements in it's decks. Zoolock might add the 4 mana Impaler legendary for example. Can't see any card as a must have in Handlock either. The Dreadsteed has some potential but I am not sold about that. -> Probably no new decks or a big change after the expansion but hopefully I am wrong.

Hunter: Lots of cards for controll hunter -> This deck will be tried out and it will probably suck
Midrange Beast-Hunter: I think this will become one of the new top tier decks with cards like Ram Wrangler and the Elephant.

Priest: Can't say which Priest deck will make it to the top but I kind of think that at least one viable Priest deck will emerge. The whole set isn't about crazy combos and also not that much about tempo (and this is the main weaknes of Priest) -> I think Priest makes a comeback with a controll deck. (maybe dragon priest but I am not sure about that)

Paladin: Hopefully dragon Paladin and I fear that aggro-paladin has become stronger. Also controll Paladin has some strong new tools. Maybe we will even see Midrange, Controll, Aggro and Dragon Paladin (which is also controll) after the expansion..

Rogue: Hard to say.. Oil Rogue is still possible but hasn't become better. Rogue is one of the hardest classes to build a good deck around in my opinion. (so it is also very hard to gues if a new deck emerges) Mill Rogue, controll Rogue, fatigue Rogue will be tried.. Maybe the new cards are enough for some kind of midrange Rogue? I don't know

I didn't mention the inspire mechanic that much. Probably at least one class can also build a deck around this mechanic but I don't know which one + Paladin or Druid might also have the chance to build a token deck.

That's pretty much what I guess.. Maybe something will become true.