It is a new concept in regards to the Waitangi Treaty.  According to Waiariki MP Te Ururoa Flavell talking about the settlement between Tuhoe and The Crown.

The difference to this settlement is that Te Urewera stands alone, Tuhoe and The Crown each share guardianship but do not have ownership over Te Urewera.

He kaupapa hou e hangai ana ki Te Tiriti o Waitangi. Koinei te korero a Te Ururoa Flavell kaitorangapu o Te Waiariki mo te whakataunga i waenganui i a Tuhoe raua ko Te Karauna. Ko te rereketanga o tenei whakataunga ka riro ma Te Urewera e pupuri i a ano, ko te kaitiakitanga kei a Tuhoe raua ko Te Karauna ara kaua tetahi o raua e tu hei kaipupuri ake i Te Urewera.