Somehow I ended up poking around in the Set Bonuses category of the database. I've never heard of these before:
Inexhaustibility: Out of Combat +Hit Points/Endurance
Large Critical Hit Bonus
Small Critical Hit Bonus
Neuron's Alacrity
Judging from the info that appears in game, they're future sets along the lines of the ATIO's we saw at PAX, I do believe?