Hunter talent · row 2 of Survival, from level 15 (10 with Talented 5/5) · Physical

Entrapment

When your traps are triggered, all affected targets are Entrapped, preventing them from moving for 1/2/3/4/5 sec.

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

Compared with Classic

Classic tooltip

Gives your Immolation Trap, Frost Trap, and Explosive Trap a 5% chance to entrap the target, preventing them from moving for 5 sec.

Data	Classic	Forever
effect 1 triggers spell	Entrapment (19185)	none
effect 1 value	0	5000

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

Matches the files
Entrapment: (Slight redesign.) Now always triggers when the Hunter’s trap triggers, but the duration is increased by more talent points instead of the chance.
The files Entrapment (19184) now roots every target your traps hit for 1/2/3/4/5 sec (tooltip; talent curve 1000-5000 ms). Classic gave a 5-25% chance of a 5 sec root on three trap types.
Entrapment Class deep dives: Hunter and Druid

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