Might of the Nerazim (level 10)

Mana: 30
Cooldown: 15 Seconds

Activate to cast an untalented version of Zeratul's most recently used Basic Ability.

Passive: After using an Ability, Zeratul's next Basic Attack within 6 seconds deals 40% more damage.

Rewind is gone. Replacement (upgrade to new ult):

Nerazim Fury (level 20)

Might of the Nerazim resets the cooldown of all Basic Abilities.

Yes, that's a 15 second Rewind.

Combo Slash is gone. Shadow Assault is now on 4:

Shadow Assault (level 4)

Cooldown: 30 Seconds

Activate to gain 40% Attack Speed for 5 seconds.

Grim Task is gone. Replacement:

Shadow Fury (level 4)

Basic Attacks against enemy Heroes grant 15% Spell Power for 4 seconds, up to 45%.

Vorpal Blade now baseline. New Level 1:

From the Shadows (level 1)

Gain 25% Movement Speed while Stealthed.

Still has Nexus Blades. New level 20:

Tipping Point (level 20)

I don't have the exact text, but it gives a second charge of Vorpal Blade