My team and I theory-crafted a bunch of decks that ended up not very good yesterday (apart from aggro shaman of course).
I love this time of card games. Everything works and everything doesn't work.
I saw the most success with a fairly basic looking C'thun priest. The amount of healing priest has no is incredible, and they have access to a lot of solid bodies to control the board while C'thun gets buffed up.
Midrange shaman is so difficult to build because there are too many cards that are powerful in a vaccuum without accounting for synergies, consistency, etc. Early verdict is that the deck was overhyped again.
Ultimately, I could see shaman take a more hybrid route so that it has the same incredible early game with just a tad more midgame.
A buddy of mine has a good aggro paladin deck brewing that could be something, and another is determined to bring zoo back in a new form.
I was hyped because I thought midrange hunter would come back into the fold, but man it got destroyed yesterday. Maybe hunter ends up going the very slow, deathrattle route and includes N'zoth.
I played for like 6 hours yesterday and feel like I made almost no progress. Awesomeness.