NATURE’S SWIFTNESS: When activated, your next Cyclone, Entangling Roots, Healing Touch, Hibernate, Nourish, Rebirth, or Regrowth becomes an instant, free and castable in all forms. The healing and duration of the spell is increased by 50%.(3 min CD)
On Garrosh realm (mists of Pandaria) this not affects Cyclone, roots, hibernate duration. only think that works is instant healing bonus.