With Patch 10.1.7, Forsaken players can participate in the Undead Heritage Amor questline and earn their armor, as well as two tabards. Forsaken players who sided with Sylvanas during the events of Battle for Azeroth receive a special quest at the end!
After completing the Undead Heritage questline, loyalist characters will receive a final quest The Long Hunt — You will see Dori'thur, in which Sylvanas will show up with a message! She is still working in the Maw, to free every soul sent there as the judgment decided by Tyrande Whisperwind during the Shadowlands epilogue.
In her message, she talks about pondering her deeds since being raised into undeath, and how although she has many regrets, she will always be proud of her part in the Forsaken finding their place in the world.
Before returning to her penance, she mentions there is a special soul that is most dear to her that has yet to be found… obviously referring to that of Nathanos Blightcaller, who was sent to the Maw in the beginning of Shadowlands by the hands of Tyrande.