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