There are two that are particularly awesome; the backing vocal harmonies during the chorus of "Lord of the Blacksmiths", which give the song an extra musical depth (kinda haunting actually) that takes the listener to the timeless world of the Blacksmith. And the ones found on the "Child of the Wild" song, you know, the ones that are reminiscent of Mithotyn's "In the Sign of the Ravens", which give an 'ancient' feel to the music.
Hopefully these will be present to some extent on the new album!