So this hat got added in the patch on Aug. 7th:
Which resembles the Horace mascot on Rock, Paper, Shotgun.
Its available for all classes and there's been some buzz and speculation about the promo item on the interwebs, However, given the fact that the rock, paper, shotgun humble bundle debuted last week, I'm pretty sure it has to do with that.
I own most of the games already so I only paid $1. No hat yet. My guess is that it will probably drop after the bundle is closed. I guess we'll have to wait and see. There's 2 days left on the bundle.
Maybe it'll be the next max's head. I doubt it, but that's the running joke. Either way, who doesn't love a good all-classes hat?
paging hat collectors @BobbyDigi