Druid talent · row 1 of Restoration, from level 10 (5 with Talented 5/5) · Physical

Nature's Focus

Gives you a 14/28/42/56/70% chance to avoid interruption caused by damage while casting Arcane and Nature spells.

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

Compared with Classic

Classic tooltip

Gives you a 14% chance to avoid interruption caused by damage while casting the Healing Touch, Regrowth and Tranquility spells.

What Blizzard said about Nature's Focus, each line checked against the files.

Matches the files
Nature’s Focus: Moved from row 2 up to row 1. Now applies to interruption while casting all Arcane and Nature spells.
The files Nature's Focus (17063) moved from row 2 to row 1 and covers all Arcane and Nature spells, still 14-70%; Classic covered Healing Touch, Regrowth and Tranquility.
Nature's Focus Class deep dives: Hunter and Druid

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