Update 3:08 PM: The below rumors are 100% true. Further details are available at Ozzfest's website and Knotfest's website.
If The PRP is to be believed (and that dude usually nails it with his rumors), Ozzfest Meets Knotfest will take place on November 4 and November 5 at the Glen Helen Amphitheater and Festival Grounds in California. Supposedly headlining the Ozzfest portion will be Ozzy Osbourne, Prophets Of Rage, and Deftones, while headlining Knotfest will be Slipknot Rob Zombie and Marilyn Manson.
Some of the support acts include Stone Sour, Testament, The Black Dahlia Murder, Kreator, Children Of Bodom, Orange Goblin, Prayers, Eighteen Visions, Baroness, High On Fire, and a ton more. Check out the full rumored lineup below, and keep an eye out for the official announcement today.