Winning PvP matches earns gold, XP and tokens. 'Gryffith the Warmaster' will handle the PvP vendor duties, and will be found in New Tristram's Slaughtered Calf Inn.
It seems the added client code also spills the beans on PvP ranks and the names of the arenas? Scout, Grunt, Sergeant, Senior Sergeant, First Sergeant and Stone Guard are possible ranks.
The Fetid Pools, Pit of the Condemned, Bastion’s Forge, Altar of Courage and Leroic’s Garden meanwhile sound like they could be the deathmatch arenas. A string within the update also, in placeholder style, says to spend tokens "to get fat loots!” The details were scried by Diablo fans over at - how apt.