Top 3% of all teams in each battlegroup get this title. And she's mine
Armory doesn't reflect it yet as of this posting (still shows rival because blizzard initially screwed up the titles, but today they finally fixed them) but it was there when I last logged out. Hopefuly it will in a few hours though.
Too bad my arena ratings went way down since two weeks ago. Pretty much impossible to do well in arena right now unless you are an arcane mage or a ret paladin, who carry an insane amount of burst damage. Sad really, pvp is so dumbed down compared to what it used to be before the last patch. Just rush in and blow sh*t up, no need for strategy anymore.