Improved OverpowerAn Arms Warrior talent in WoW Forever: row 2 of the Arms tree (level 15), 2 ranks, passive. Moved since Classic, same effect (was Arms row 3). Read from the WoW Forever beta client.
What it does Arms row 2

Improved Overpower2 ranks · passiveRequires 5 points in Arms Talents (level 15).Rank 1: Increases the critical strike chance of your Overpower ability by 25%.Rank 2: Increases the critical strike chance of your Overpower ability by 50%.Moved, same effect (was Arms row 3). Classic rank 1: Increases the critical strike chance of your Overpower ability by 25%.
What changed from Classic
Around it in the Arms tree
Gone from Classic ArmsAxe Specialization, Mace Specialization, Sword Specialization, Polearm Specialization.
Every Arms talent 17
From the WoW Forever beta client, checked in game with reader reports. Put points in Improved Overpower in the Warrior calculator, read every Warrior talent in words (Fury and Protection too), or see the racials, changed class abilities and Legacy perks.