Hearthstone changes have been announced but not date specified, but it should be between Jan 14, 2020 to Jan 17, 2020. As stated earlier they promised to check other Galakrond decks, and other strong meta decks, but ultimately they hit Galakrond shaman decks even more.

Upcoming Changes to Constructed Play

Rogue

Fiendish Rites – Now costs 4 mana (up from 3).

Fiendish Rites

Warrior

Scion of Ruin – Now costs 4 mana (up from 3).

Scion of Ruin

Ancharrr – Now has 2 durability (down from 3).

Ancharrr

Shaman

Dragon’s Pack – If you’ve invoked twice, it gives Wolves +2/+2 (down from +3/+3) – Wolves will be 4/5 Taunts now.

Dragon's Pack

Invocation of Frost – Now costs 2 mana (up from 1).

Invocation of Frost

Rogue

Necrium Apothecary – Now costs 5 mana (up from 4).

Necrium Apothecary

Neutral

Dragonqueen Alexstrasza – Her Battlecry can no longer generate another copy of herself.

Dragonqueen Alexstrasza

All of those cards will be disenchantable for full crafting cost for 2 weeks after the patch.

Battleground Changes

Heroes

Shudderwock 

Burbling: Cost reduced from (2) to (1).

Shudderwock

Queen Wagtoggle

Wax Warband: Give a random friendly Mech, Demon, Murloc and Beast +2 Attack. (instead of +1 Health)

Queen Wagtoggle

Infinite Toki

Temporal Tavern: Cost reduced from (2) to (1). Now reads, “Refresh Bob’s Tavern. Include a Minion from a higher Tavern Tier.”

Infinite Toki

Patches the Pirate

Has returned to the Battlegrounds Hero Pool.

Fire the Cannons!: At the start of next combat, deal 4 damage to two random enemy minions. (increased from 3 damage)

Patches the Pirate

Pyramad

Has returned to the Battlegrounds Hero Pool.

Brick by Brick: Give a random friendly minion +3 Health. (increased from +2 Health)

Pyramad

Minions

Golden Soul Juggler

After a friendly Demon dies, deal 3 damage to a random enemy minion twice. (instead of 6 damage once)

Soul Juggler Gold

Bug Fixes and Game Improvements

Battlegrounds: Selfless Hero’s Deathrattle will now only affect minions that do not already have Divine Shield.

Arena: The appearance rate of cards in the draft has been updated to ensure class balance remains close to the ideal 50% win-rate. Specifically, the win-rate of Druid, Hunter, and Paladin should now be decreased. The win-rate of Priest, Rogue, Shaman and Warlock should now be increased. Card appearance rates for Mage and Warrior remain untouched.