Warrior talent · row 4 of Arms, from level 25 (20 with Talented 5/5) · Physical

Impale

Increases the critical strike damage bonus of your abilities by 10/20%.

Game files · build 1.60.1.70291Read straight from the WoW Forever beta client.

Compared with Classic

Classic tooltip

Increases the critical strike damage bonus of your abilities in Battle, Defensive, and Berserker stance by 10%.

What Blizzard said about Impale, each line checked against the files.

Matches the files
Deep Wounds is once again a required talent to reach Impale.
The files Build 70291 added a Deep Wounds to Impale link (trait edge 136737); Impale sits in Arms row 4 under Deep Wounds in row 3.
Deep Wounds Impale Development Notes, October 8

69876 Sep 16First beta build we archived. No changes in the client files since.