https://www.reddit.com/r/gwent/comments/6l20tt/dev_stream_summary_all_changes/
Refund System - Premium cards will be disenchanted for full scrap and powder value. There is a 3 day period to mill nerfed cards.
Fixes - Dagon and Henselt challanges are fixed. Fixed the issues with Disloyal units on Consoles.
BALANCE CHANGES:
Biting Frost - Has the ability of current Torrential Rain, except it will only affect one of the Lowest Units.
Impenetrable Fog - Current ability, but only one of the Highest Units.
Torrential Rain - Damage 5 of the Lowest Units by 1.
Aeromancy - Now plays chosen Bronze / Silver Weather from the Deck.
Skellige Storm - Will deal 2 - 2 - 1 Damage now.
Stammelford's Tremors - Damage 6 enemies by 2 (instead of 8).
Overdose - Reworked; Boost 6 random allies by 2.
Bloodcurdling Roar - Bear will be 11 Strength now (from 12) and is Doomed.
Alzur's Double Cross, Decoy, Marching Orders - Will Boost now (instead of Strengthening).
Olgierd - 9 Power from 7. Gets weakened by half (rounding up).
Roach - Will be summoned before Gold cards abilities are resolved. (Milva and Vilgefortz)
Johnny - The ability won't trigger, if the corresponding card is missing from the opponent's Deck.
Renew - Now restricted to the owner's Graveyard.
Villentretenmerth - 8 Strength (from 4), after 3 turns will Destroy the Highest Unit(s) once.
Avallac'h - 8 Power from 10.
Regis: Higher Vampire - Will boost himself by the Base Power of a chosen Units.
Radovid - 5 Power from 4.
Shani - 4 Power from 3. Adds 4 Armor (instead of 3).
Priscilla - 4 Power from 5, 4 Turn Timer
Dandelion - Will shuffle the Deck after Boosting.
Kaedweni Siege Support -
Reinforced Trebuchet - Power changed from 5 to 6.
Reinforced Ballista - Won't ignore Armor anymore.
Caleano Harpy - Power changed from 4 to 3.
Ancient Foglet - Power changed from 6 to 7.
Wild Hunt Hound - Power changed from 5 to 4.
Nithral - Power changed from 4 to 7. Frost damage is increased to 3 (instead of 2).
Caranthir - Power changed from 5 to 7. Moves 3 Enemies (instead of 5). Biting Frost changes apply to him.
Succubus - Power changed from 6 to 5. Its ability will trigger at the end of its owner's turn.
Elven Mercenary - Loyal
Vrihedd Sapper - Power changed from 7 to 8.
Dol Blathanna Trapper - Power changed from 5 to 6. Fireball Trap will no longer obscure Armor.
Dwarven Mercenary - Power changed from 5 to 6.
Saessenthesis - Power changed from 7 to 9.
Ithlinne - Power changed from 4 to 5.
Spotter - Power changed from 3 to 4.
Alchemist - Power changed from 7 to 8.
Cynthia - Power changed from 4 to 5.
Serrit - Power changed from 7 to 9.
Emhyr var Emreis - Power changed from 4 to 6.
John Calveit - Won't be able to play Gold cards. Imperial Golems will be played before John's ability is triggered.
Stefan Skellen - Power changed from 9 to 10.
Leo Bonhart - Will damage by the revealed Unit's Base Power.
Morkvarg - Power changed from 8 to 9. Gets weakened by half (rounding up).
Savage Bear - Power changed from 6 to 7. Affects both sides again. No longer hits spawned Units. Fixed the bugs related to Savage Bear.
Clan an Craite Warcrier - The Effort effect is removed.
Clan Drummond Shieldmaiden - Removed Veteran Ability.
Clan Tuirseach Axeman - Removed Veteran Ability. Power changed from 2 to 3.
Berserker Marauder - Power changed from 6 to 8. Strengthens self by 1 for each Damaged Allly (instead of Enemy).
Kambi - Hemdall Power changed from 11 to 16.
Hjalmar - Power changed from 15 to 13. Lord of Undvik is Doomed.
Ermion - Power changed from 6 to 7.