Shane himself runs three days a week with his original Return to Greyhawk plus his spin-offs Vile & Villainous and Mordenkainen's Path of the Planes Vets from RtG show will be running their own games now. Travis is heading Lords of Pain which will be a political intrigue set during the Greyhawk Wars, and as teased before Dani will be running The Dying Kingdom which is assuredly a jaunt through the ever dangerous Great Kingdom ruled by Ivid the Undying.
New to the fold are fellow GHC enthusiasts like Sean from the DMsGuild and PowerScore blog fame. He has started a run into the famous ruins of Castle Greyhawk. Not to be outdone, Grant is doing the long play by running the entire Queen of Spiders series, which means plenty of Underdark, Kuo Toa, Drow, and naturally Llolth herself.
Encounter Role Play has a couple other talents in on the summer block. Most intriguing to me is Lindy's show, Vecna Lives. I really want to see how this quite evil, classic module plays out in 5E rules. Last but not least, Greg has a game called Valley of Soot & Skull which is tied to the current events of the Shield Lands.
There you have it. All this in one shared universe of campaigns on the Greyhawk Channel. DMShane is surely not done adding new games either!
Update 06/24/2021: Removed and fixed some links. The GHC is now done, but all these fine people have videos archived on YouTube.