I really hope they manage to get Control Warrior out of the abyss. I really like the metas that are a bit slower than it is right now. I feel like most of my games don't even go to 10 mana anymore. I either get faced to death by an insurmountable amount of stats on the board or just explode from a Brann Bronzebeard + Sire Denathrius combo. The powerlevel in HS is crazy high these days.
But the little tweaks that leaked look promising so far, let's see.
2
I am assuming they will take some from paladin and mage and buff shaman.
Nerf predictions:
First Day of School -> 1 mana
Conviction -> 2 attack
Incanter's Flow -> 3 mana
Mankrik, Consumed by Hatred -> 7 health
Crabrider -> 3 health. I hope they would switch South Coast Chieftain or Magicfin in as neutral and make Crabrider shaman as the nerf will hit murloc hard.
Buff predictions:
Mana Tide Totem -> 2 mana OR 5 health
Tidal Surge -> 3 mana
Shattered Rumbler -> If you cast a spell last turn, deal 2 damage to all enemy minions.
Tinyfin's Caravan -> 1 mana
Prospector's Caravan -> 1 mana
Soldier's Caravan -> 1 mana (This change is properly a bit dangerous)
Apothecary's Caravan -> 1 mana
Soothsayer's Caravan -> 1 mana
Dark Inquisitor Xanesh -> 4 mana
Toad of the Wilds -> gain +3 Health
5
The list is still very much in "work in progress", you can also discover a Lady Vashj from a Primordial Studies. I would properly try Marshspawn, Speaker Gidra, Lightning Storm, Tidal Surge, Torrent or Ras Frostwhisper,
Taelan Fordring can draw Ras Frostwhisper if you draw Malygos the Spellweaver early.