“This mount shows a proclivity for snacking upon the souls cast out of Revendreth.”
Something I suggested ages ago was that the each PvP Season could reflect the theme of one of the Covenants. So this text could be an indication that it might be what Blizzard are going for. The first Season being themed around Revendreth, and the following Seasons being themed around Bastion, Ardenweald, and Maldraxxus.
Maybe.