World buffs will not work on targets that are higher than level 63 (DM Buffs, Rallying Cry of the Dragonslayer, ZG Heart, and even some MC mobs).
- "Fengus' Ferocity","Mol'dar's Moxie","Rallying Cry of the Dragonslayer", "Slip'kik's Savvy" and "Spirit of Zandalar" these buffs will no longer work on targets over level 63.
- Scarshield Spellbinder: The fire resist buff from this creature will no longer work on targets over level 63.
- The "Arcane Destruction" buff cast by Sethekk Scryers when mind controlled or spell-steal is used, will now be automatically dispelled when a player leaves the instance.
For examples from the patch notes.
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The main item-type I'm wondering about is the consumable jewelcrafting pieces that cast a group buff, specifically the damage absorbing necklaces. I haven't heard of anyone using them for resist fights yet, but they'll be annoying if they ever get calculated into the math with their one hour cooldown.