We don’t know the Extend yet, but it’s very likely to be similar to the Primalist one and the Sentinel on that is also coming in 0.8.4, which already got teasered
Edit: Here is the link New Model and Armor Sets for Sentinel coming in 0.8.4
Not sure if Acolyte and Mage also will receive totally new armors.
I hope Acolyte will get new Armour models.