Blizzard just posted the latest patch notes, and they include some big balance changes for Standard, Battlegrounds, and Duels.
Patch Notes: https://news.blizzard.com/en-us/hearthstone/23892228/25-2-2-patch-notes
Timestamps
0:00 Introduction
0:16 Standard Nerfs
7:56 Standard Buffs
17:42 Battlegrounds
18:41 Duels
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News | Hearthstone | TONS OF BUFFS & NERFS!! Huge Duels changes! This patch is BIG.