There is a possibility that Sylvannas Windrunner might appear in the upcoming World of Warcraft Dragonflight Patch. Wowhead discovered a spell named Sylvanas on the PTR, although there are no further details available about this finding.
The Sylvanas spell doesn’t provide much information, but it shares similarities with other spells related to Sylvanas in Shadowlands. It could be a random spell added in the recent patch for unrelated reasons, but the timing aligns with the Forsaken getting their Heritage Armor Questline in Patch 10.1.7, makes it seem more than just a chance occurrence.
After her actions in Shadowlands and her involvement in the burning of Teldrassil that marked the end of Battle for Azeroth, The Dark Lady was last witnessed being banished to The Maw, where she faced the consequences of her deeds. Anduin Wrynn, formerly a prominent Alliance leader, chose to accompany her into The Maw after succumbing to The Jailer’s influence. However, her current whereabouts remain a mystery, as nobody knows what has become of her.
Patch 10.1.7 precise release date is still unknown, but we can anticipate it to arrive in the fall of 2023.