Originally Posted by ARM3481

Oh, so along the lines of the Zidormi thing to swap between old and new versions at max level.

Maybe, though it doesn't seem likely the Covenants themselves would invade, since they'll be our allies by the end of our questing experience, or we wouldn't be able to champion them at the end. If something were to bring their agents through to Azeroth I would imagine it being some of their own local threats (like the Forsworn in Bastion or the Drust we'll be supposedly encountering in part of Ardenweald) crossing over and needing to be re-killed or banished to send them back. Or maybe some renegade Necrolords or Venthyr who split from the rest and try to poach anima from living souls or something.

That said, I feel like keeping us questing exclusively in the Shadowlands may be a priority during this expansion, so I'm not sure how much time we'll really be spending back on Azeroth outside of doing one's Auction House chores and such in Stormwind and Orgrimmar.