From the way I understood the augment they will add some effect at our archetype ability base on the second classe you choose.
So let's share some speculation.
If I'm a Tank with a ability Shield Guard : keep your shield in front of you add block 70% of damage but slow you for 50%.
And now let's add the secondary classes.
+Fighter : Shield Guard will end after 3sec with a slash of your weapon in front of you that deal 120% damages.
+Tank : Shield Guard block 90% of damages , slow you for 30% and your heavy steps deal close aoe damage.
+Rogue : Shield Guard got smoke effect that prevents those who are behind you to be targeted.
+Ranger : you place your weapon on top of your Shield Guard and allow you to throw 3 energy spears in front of you that deal 40% damages.
+Mage : Shield Guard spread a elemental storm for 4sec dealing 30% damage per sec.
+Cleric : Shield Guard become a light screen that heal allies behind the Paladin.
+Summoner: The Keeper summon a Shield minion who stand in front of a alli allowing him Shield Guard for 4 sec
+Bard : Hit your Shield Guard in rhythm with your weapon, giving at your nearby allies a buff of 30% damages reduction.
This is how I'm speculating it will look like.
What do you thing of it ?
Share your ideas of augment for a others abilitys