Demon Hunter - aggressive is very good, maybe overpowered. Control/big demons is outclassed by galakrond and highlander stuff and isn't relevant. The super busted demon hunter cards like skull and eye beam really want a low curve. You don't want one of those big guys stuck in the left of your hand turning those cards into bricks.
Rogue - Very strong. Stealth aggro could definitely work. New secret package and maybe even the stealth package slots into galakrond.
Warrior - Galakrond warrior still good with a few worthwhile new cards. Pirate warrior might make a comeback now that they can tutor Ancharr.
Mage - I don't know. Spells only deck seems lack luster, but spells only hunter blindsided the entire community so I'm just not going to say anything. There might be a version of reno mage that's good, but without Luna's Pocket Galaxy the deck has to be completely reworked. There's some more stuff for a cyclone deck but losing Elemental Evocation really hurts that deck. I don't expect much
Warlock - Zoo stuff seems good. 4 mana 5/5 with rush that draws three cards. Sure, why not. There's also new 8 drop that seems decent for slower decks.
Druid - there might be some nutty Kael'thas combo thing that works. I don't know how to build that deck, so I'm filing it under "maybe." Quest Druid probably still works. Tier 2 or so.
Priest - Rez priest loses cloning gallery, but I don't think that's fatal. It loses mass hysteria, but they're getting more aoe options via the rework. It wouldn't surprise me if the deck stuck around. Also, I predict more aggro stuff so it'll have a better field to play against. There might be some weird curve midrange deck with the 2/3 that buffs health, buffed temple enforcer, injured tol'vir/blademaster and circle. You just drop thick boys, heal and value trade and slowly roll the aggro decks. It seems like it could work.
Shaman - Its only viable, if you can call it that, archetype of aggro shaman gets murdered by rotation. I don't think any of the new stuff makes a brand new deck that's good enough. Dead class.
Paladin - I'm cautiously optimistic about librams. I picture some kind of midrangey control deck. Normally I'd think that deck just gets blown out by galakrond, but with a roided equality as one of the librams... sure I could see it. Enough tempo to keep up, justice past their swing turns, and the free stats from a bunch of wisdoms to keep up or win past that. And Libram of hope is just a better Ragnaros, Lightlord you can run two of. And it costs 3 sometimes. High hopes. Viable murloc paladin is not outside the realm of possibility.
Hunter - Got a few nice cards. I think Leoroxx is powerful but doesn't have the support right now, at least in standard. Their existing archetypes should keep chugging with a couple new cards each, like Zixor + ingenuity in highlander.