Hearthpwn

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This is just a theorycraft. I will gladly add more tips here, after the expansion launches and I actually play with the deck.

I don't know how EXACTLY the RoS meta will look like - dunno whether we will see more aggro or control decks (due to the strength of Control Warrior) - so if it becomes really slow, you can add more burn spells like Pyroblast or Mirror Image/Magic Trick for more stalling/burn. You can also add a Sorcerer's Apprentice, in order to cycle cheap spells with Stargazer Luna or transform them into Fireballs with Archmage Antonidas. Mana Cyclone isn't a bad minion, but there aren't many burn spells to get from him, so I will pass on his inclusion.

Small combos:

Ray of Frost & Shooting Star  - can be used to slow down a big minion (or to kill 3 fragile ones), to cycle through your deck with Stargazer Luna or to transform them into Fireballs with the assistance of Archmage Antonidas.

Kalecgos + Pyroblast puts the control player in a tough position. They will be forced to find a way to kill your dragon and to heal themselves, which may not always be possible.

Kalecgos + Blizzard/Frost Nova is a huge tempo play. Against a full board, the opponent will hardly find answer for the dragon, which will allow him to cast yet another spell for free.