So being a mainspec Disc, running the current DPS Int cloak gave me the best stats in ToT since I barely needed the spirit. I assume the Healer Cloak proc is only going to be applied to the Healing cloak correct? If so, should I purchase a new Healer 600 cloak before completing the augment quest line tomorrow when 5.4 goes live?
In order to get the healer legendary you need to have the spirit cloak, to which you then apply the usable item you get form the legendary questline (which in turn gives your spirit cloak the healer proc).
If you applied the item to the non-spirit cloak, you would get the legendary with dps proc.
So if you want to have the healer proc, you need to have the spirit cloak and apply the item you get from the legendary quest to the spirit cloak.
Once you complete the quest to obtain the item to create your first Legendary Cloak, the Legendary Cloaks are available for sale from the Blacktalon Quartermaster in the Inn for 10k gold. Just use the item on your DPS cloak then buy the healing one.
I also am a disc and found the DPS cloak better in terms of Stats. However i did not want to go trough the trouble the problem mentioned above. so i just took the healing one with Spirit.
I worked around the spirit to replace a few items that had none so i would not end up with a hug amount of it.