Hunter ability · learned at level 22 · Nature

Scorpid Sting

9% of base Mana35 yd range

Instant

Stings the target, reducing the target's chance to hit with attacks by 2% for 20 sec. Only one Sting per Hunter can be active on any one target.

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

Compared with Classic

Classic tooltip

Stings the target, reducing Strength and Agility by 20 for 20 sec. Only one Sting per Hunter can be active on any one target.

Data	Classic	Forever
effect 2	present	removed
effect 1 aura	stat (29)	aura (54)
effect 1 spell power coefficient	0	1
effect 1 value	-20	-2
cost	70	0
cost (% of base)	0	9

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

Matches the files
Scorpid Sting now reduces the target’s chance to hit by 2% instead of reducing the target’s Strength and Agility.
The files Scorpid Sting's effect changed from -20 Strength and Agility (aura 29) in Classic to -2% chance to hit (aura 54) for 20 sec (tooltip and effect value).
Scorpid Sting Class deep dives: Hunter and Druid
Matches the files
Improved Stings: Formerly Improved Serpent Sting. Moved from row 4 up to row 2. Larger increase to Serpent Sting damage, and now also shortens the cooldown of Viper Sting and increases the duration of Scorpid Sting.
The files Improved Stings (1310661) is in Marksmanship row 2; Classic's Improved Serpent Sting was row 4. It gives +6/13/20% Serpent Sting damage (Classic 2-10%), -2/4/6 sec on Viper Sting's cooldown and +15/30/45 sec on Scorpid Sting (tooltip and talent curves).
Improved Stings Improved Serpent Sting Serpent Sting Viper Sting Scorpid Sting Class deep dives: Hunter and Druid