The average quality of cards in the Arena selection for the hunter, villain and warrior has been reduced.
The average quality of cards in the Arena selection for the druid, mage, paladin, priest and sorcerer has been increased.
Since the publication of this article, the return of the secret dust introduced in the last update of December 2018 is no longer available.
Changes in the Rumble Run
Changes in received cards: increased probability of cards having synergy with shrines.
Changes in the choice of chapels: After entering the latest update, each time a player loses, he always gets a choice of the chapel he has just lost. You will also be able to choose a chapel, which the boss defeats the player in the last series, as before.
You can read more details here.