The ranking is currently unavailable as we add in a new feature that will display a character's recent PvP activity to PK profiles, as weil as server wide latest activity stats that will show who killed who and in which arena. This will further help us catch kill farmers as the entire community would see your last 25-50 kills. Also, will help players see who is killing them and instantly be able to "lurk" their profile and check out their PvP stats.
We are also thinking of listing a character's Hero Rank and Division Rank on the PK profiles and possibly show those ranks as badges instead of pure text. (eventually)