So with the release of the pre-patch on Wednesday (or tomorrow if you're American), the Legion loot system is going to be applied to all HFC loot. This creates an issue in my mind with current WF being +6 and Legion having the system roll for +5 on an item, then rolling again and so on until it fails.
Are they going to reroll all the gear we already have? This could potentially mean we lose ilvls. I could just wait to find out, but I'm kinda impatient, so if anybody knows what they're doing with it, please let me know.
Source:
"Hellfire Citadel Loot
Hellfire Citadel loot is now part of the new Legion bonus system. This means that instead of hoping for a Warforged upgrade of +6 ilvls, your Hellfire Citadel item can have a variety of item levels, in increments of +5 ilvls.
Anything up to +15 over the base ilvl has the "Warforged" description.
Any loot over +15 of the base ilvl has the "Titanforged" descirption."
From a wowhead article on the prepatch.