Per the official patchnotes posted on Wowhead.
Azerite Traits
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Blade in the Shadows now reduces the cost of Shadowstrike by 2 Energy as a non-stacking bonus. Damage bonus reduced by 40%
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Echoing Blades (replaces Fan of Blades) - Fan of Knives damage is increased by 321. For each of the first 5 critical strikes, it will fire a second spray of knives at that location, dealing 1282 damage to enemies within 8 yards.
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Keep Your Wits About You (replaces Storm of Steel) - Each time an attack Blade Flurries, increase the chance for Sinister Strike to strike again by 2%. Additional strikes of Sinister Strike deal 1844 more damage.
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New: Lying in Wait - While no enemy is within 12 yards, heal for 689 every second. While any enemy is within 12 yards, gain 173 Speed
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Nothing Personal (replaces Poisoned Wire) -Vendetta poisons the target, dealing 11049 damage over 20 seconds, and grants you 40 energy over 20 seconds.
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Perforate now reduces the cooldown of Shadow Blades by 0.5 seconds when Backstabbing an enemy from behind.
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Replicating Shadows (replaces Sharpened Blade) - Each combo point spent has an 2% chance to cause your Nightblade to deal 5843 Shadow damage and spread to a nearby enemy.
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The First Dance redesigned. Activating Shadow Dance now grants you Combo Points and increases your Haste for its duration.
Subtlety
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Shuriken Combo (baseline passive) removed.
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Shuriken Storm damage increased by 35%.
PVP
Assassination
- Shiv now costs 35 Energy, and now applies Deadly, Wound, and Crippling Poison to the target.