Yes a story-progression locked spec somewhere hidden behind several patches and update. A tank on demand play similar to old Demonology Warlock from TBC - Earthwarder spec primarily drawing the powers of the one and only dragonflight not utilized by both spec.
Will focus on several mechanics such as disorient, absorbs, knockdown/back. HP regen centered on dragon's blood, draconic being and things that goes around this kind of playstyle.