...Appears to be: "Venom Zest: Increases your maximum energy by 15. Increases your energy regeneration rate by 5% for every enemy you have poisoned, up to 3."
Hat tip to Rfeann, our red-hatted rogue reporter for getting the scoop.
Not *too* excited about this, as I was hoping for an AoE finisher or a cooldown of some sort, but it does change gameplay a bit. I wish it wasn't essentially venemous wounds for every spec. Combat seems like it will gain quite a bit of energy in cleave situations, though. The "theme" of the tier seems kind of ambiguous with this, shadow reflection, and DfA.