I thought you might be interested to know the following: a few days ago I went past the area in which they plan on filming ( in the Tongariro National Park, at the Tukino Skifields ), and I took some pictures of the area. I think there are two options on what they are gonna shoot: a: which is the more likely because they are planning on shooting this autumn, it’s Mordor. or b: which it could well be, it’s Hollin and the gates of Moria.
What made me think this: the area before the skifields is a barren land with a lot of low vegetation, plants etc. And at some points there are some small streams flowing through, which could well be the ones from the gates.