Blizzard just released patch notes for the 24.0 patch with some new features and content, and balance changes to various game modes.
Patch Notes: https://hearthstone.blizzard.com/en-us/news/23831405/24-0-patch-notes
Reward Track Blog: https://hearthstone.blizzard.com/en-us/news/23831402/rewards-track-refresh-for-murder-at-castle-nathria
Timestamps
0:00 Intro
0:33 Battlegrounds
2:21 Mercenaries
3:01 Duels
6:57 Arena
7:13 New Features
8:46 Rewards Track
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News | Hearthstone | DUELS NERFS!! New features! New BG stuff! Expansion patch!