Hearthpwn

Before launch prediction: After the rotation the Keleseth buff will be probably better than the Demon buffing synergy so no Vulgar Hum or Demonfire just Kele and more 1 drops. Pretty usual list othervise.  The new 3 mana minion Tangelfur Mystic is just perfect for Zoo and the other Withcwood card I use, the new Imp, is pretty solid too.

Update after the launch:  The deck is amazing! I only played a couple matches but I haven't lost yet, rank 5 currently. The deck feels really good, you have a smooth curve even if you don't hit Keleseth on T2. I will play more and update the this description.

 Matchup's and "Why no Bloodreaver Gul'dan, Lich King, Bonemare, etc.?

Against aggro, which is Baku Hunter and Baku Pala (I only met these aggro decks) you have enough tools to defend yourself (Saronite Chaingang, Tar Creeper, Despicable Dreadlord) until you can flip the taple and kill your opponent with your aggressive stuff like Doomguard. 

Against control you want to close out the game ASAP! You can try do it with the Lich King, the DK or with Bonemare but I think it is better to play more 1 and 3 drops to have a more consistent, smooth curve. 

Against midrange: I've only met with 1 true midrange deck, the Rush Warrior. I don't really know how favored that matchup is but you can beat it for sure. (I think it depends on how hard you can pressure them in the early turns)

If you have any suggestions please share it with me in the comment section!

Good luck and have fun!

 Update (04.16.):  -2Dragonslayer +2 Soulfire