HT, a somewhat similar system does exist. The H-60 has a horizontal stab that pivots. It has a cockpit position indicator, an automatic movement system, and a manual movement override.
I'm not sure of these figures, but I believe the stab moves to the level position as 40kts or higher, and moves to 40 degrees front edge up below 40kts. Nick can comment on this, but I believe the idea is to prevent the main rotor downwash from blowing the tail down at low speeds.