Also something to remember, the covenant abilities will likely have secondary abilities attached to them at some point. Things like Door of Shadows becoming an instant cast, Door of Shadows providing a temp speed buff after teleporting, activating Avenging Wrath giving a free Divine Toll, ect.
Rumor is they are tied to legendaries, but here is the confirmed list so far - https://shadowlands.wowhead.com/news...ws-post-311922
Open Doors for Door of Shadows is pretty sexy