We've datamined new Dreadlord's Regalia armor sets and animated wings in the latest Patch 10.2 PTR build. It's currently unknown if or how this new armor set might be obtainable, especially since the Dreadlords have not been part of the Dragonflight narrative thus far.
The Dreadlords or Nathrezim returned to the Shadowlands during the anima drought as servants of Sire Denathrius and the Jailer. However, with the Jailer's defeat, the Nathrezim now only answer to Denathrius, yet the current whereabouts of Remornia, Denathrius, and the Dreadlords remains unknown.
The above icon names the cloak wings as part of the 'Dreadlord's Regalia' set but is not attached to any current items or spell in-game. The below images show the full set in all of its glory including the animation for the Dreadlord Wings cloak.
Could this be a sign of what's to come for Wow in the next expansion?
The Secrets of Azeroth Epilogue suggested that the forces of Void, Order, and Fel could be working together via an artifact that Tyr locked away within Tyrhold.
Since the Nathrezim have previously worked with various cosmic forces of Azeroth (Fel with the Burning Legion, Death with Sire Denathrius), could this be how we next see the Dreadlords return?