These rings were added, one can assume, over a lot of protest and QQing by tanks and healers. While the two rings currently in the game can be used by both roles in some situations, they are by no means what healers or tanks would be looking for.
As a Protection Warrior I'm looking forward to this change going live. I'll have to fork over another 8,000g or so, but such is the price of epics.
A closer look at the rings and their stats after the break.