It looks like Featured Instance jewellery is upgraded slightly (about 5%) in Update 19. The stat goes from 221 to 234, the Morale goes from 782 to 833, and the mitigations from 799 to 843.
If you were thinking of buying some FI jewellery (25 Long-Lost Coins each), you might want to wait. So far, the FI armour has not changed.