Looking back at some of the datamining articles on RiftGrate, I stumbled upon the ‘Dark Skin’ sets of skins that were datamined back in April 2014.
It had a new ‘familiarity’ to it. Turns out this skin datamined all the way back in April was for the Warrior “Sea of Dreams” Armor Set:
Dark Skin
The skin, ‘pieced’ together back in April 2014.
RIFT 3.0 Sea of Dreams Plate Armor Concept Art
The helmet and some of the other details on the skin are a clear match with the ‘Sea of Dreams’ Plate Armor.
This suggests that Trion may have had this set ‘ready’ on the PTS since April. As more 3.0 information is revealed, I’m sure we’ll start to piece together some of the other skins and models that have yet to be attributed to anything.
RiftGrate 
Usual big shoulders and skulls…. though that should be one of the few full plate helms for females which will be nice.