Druid talent · row 2 of Feral Combat, from level 15 (10 with Talented 5/5) · Physical

Brutal Impact

Increases the stun duration of your Bash and Pounce abilities by 0.5/1 sec and reduces the cooldown of Bash by 15/30 sec.

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

Compared with Classic

Classic tooltip

Increases the stun duration of your Bash and Pounce abilities by 0.5 sec.

Data	Classic	Forever
effect 2	none	flat spell modifier -30000 (new)

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

Matches the files
Brutal Impact: Now also reduces the cooldown on Bash.
The files Brutal Impact (16940) added 15/30 sec off Bash's 60 sec cooldown and keeps the +0.5/1 sec stun.
Brutal Impact Bash Class deep dives: Hunter and Druid

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