I havent watched the thing, but here they only have it as "Hair showing under hats is definitely one of the things on Holly's radar!" www.wowhead.com/news/portal-room-q-a-with-executive-producer-holly-longdale-381024

which isn't nothing, before I dash anyone's hopes, but not exaaaaactly a concrete "it's coming" either. Hm! here's hopin'