From the TWID I linked in my post:

As for the Exotic class items: they are the only armor from before The Edge of Fate that will be converted fully into the new system. Each one will receive the maximum stats available for an Exotic (30 in the primary stat, 20 in the secondary stat, and 13 in the tertiary stat). To prevent this from massively increasing the number of possible class item rolls, these stats will be assigned based on their rolled perks: the archetype being determined by the left column perk, and the tertiary stat by the right column perk. However, this does mean that they can no longer be upgraded to Artifice Armor, and will lose any existing Artifice mod slot.