The Cavalier Fighter, straight outta Unearthed Arcana by the Big G himself.I'm actually kinda scratching my head on this, I don't think there are any UA subclasses that really scream "greyhawk" and, tbh, as someone who's never played in it I don't really know how one would make a "greyhawk themed" subclass the same way one might make an FR or Eberron or Dark Sun subclass.
How dare you take such a nuanced and open minded position towards other people's joy, in clear defiance of all our most sacred traditions.That's how I feel about Dark Sun, Ravenloft, the Forgotten Realms, Spelljammer, Planescape, Dragonlance, and Mystara... But, you know, other people like those settings and I'm not the only person in the universe that matters.
Why? He says it's official. I'm inclined to take him at his word, especially since Dan Ayoub was sitting right next to him!Expecting this to be a DMs Guild thing like Greenwood's and Baker's Forgotten Realms and Eberron stuff. That doesn't make this any less cool, though.
Specifically, they were interspersing talking about Gygax Greyhawk material and upcoming product Seasons.Based on the discussion this definitely seems like something you will be able to buy in a store, or at a con. It won’t just be online.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.