It’s obviously she won’t physically return for this heritage questline. Sylvanas has to stay in the Maw until she’s retrieved all the souls she damned.When she does return to Azeroth, she’ll be living in exile in the Plaguelands. Never to set foot in any Alliance or Horde settlements.
She can stay in Torghast for a couple more expansions, thank you
Too Soon! You have awakened her too soon Danusecutus!