I'm just utterly speculating here, but maybe that gear was created to purposely be introduced later? 'Develop now, save time later for patching and bugs etc'
Apparently Rise of Rakghouls started development a year ago and that was only released one month after the game was live, I think that was planned.
This is however just my guess. I would love to see those mentioned armour sets and features in game soon. I care about looks just as much as I do about damage and healing.