While I can't see it for myself yet, somewhen in 7.2, WTB World Quest Missives, or Licenses, akin to the scrolls known from the Garrison Quartermaster*.
Though considering the amount of WQ, I won't be surprised if they go with one item that invokes yet another random quest.
That doesn't have to be related to pets at all.
Oh, and Dalaran space is limited.
Immersive? Not very much, at a first glance. But none disallows the tamers to get a little… recommendation of our curious adventurers and their companions.
* no Artifact Power Quests included.
I wait for a first post or comment saying directly "bring back MoP" in the context of pet content.
Unless there's already one, I'd like to see it.