Hunter talent · row 4 of Beast Mastery, from level 25 (20 with Talented 5/5) · Physical

Ferocity

Increases the critical strike chance of your pets and hawks by 2/4/6/8/10%.

Game files · build 1.60.1.70245Read from the WoW Forever beta client, build 1.60.1.70245.

Compared with Classic

Classic tooltip

Increases the critical strike chance of your pets by 3%.

Data	Classic	Forever
effect 1 value	3	16

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

Matches the files
Ferocity: Critical strike bonuses to pets decreased, but now also benefits Hawk summons.
The files Hunter Ferocity (19598) gives pets and hawks 2/4/6/8/10% crit in 70245; Classic gave pets 3/6/9/12/15% (tooltip and talent curve).
Ferocity Class deep dives: Hunter and Druid
Matches the files
Ferocity: Now also applies to the new Primal Bite talented ability.
The files Druid Ferocity (16934) lists Maul, Primal Bite, Swipe, Claw and Rake, and its class mask includes Primal Bite's flag.
Ferocity Primal Bite Class deep dives: Hunter and Druid

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