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

Flurry

Increases your attack speed by 5/10/15/20/25% for your next 3 swings after dealing a melee critical strike.

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

Compared with Classic

Classic tooltip

Increases your attack speed by 10% for your next 3 swings after dealing a critical strike.

Data	Classic	Forever
effect 1 triggers spell	Flurry (16257)	none

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

Matches the files
Enrage is no longer required to reach the Flurry talent.
The files Edge 124811, Enrage to Flurry, is deleted by the 70245 hotfix.
Enrage Flurry Warrior updates, October 2
Matches the files
Death Wish is now required to reach the Flurry talent.
The files A new Death Wish to Flurry edge (136736) arrives in the 70245 hotfix, and Flurry moves under Death Wish in row 6.
Death Wish Flurry Warrior updates, October 2
Matches the files
Flurry: Total increased attack speed reduced by 5%.
The files Classic 10/15/20/25/30% attack speed; 70245 5/10/15/20/25% (talent rank values, spell 12319).
Flurry Class deep dives: Priest and Warrior

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