The official website for Lollapalooza 2012 has not yet been updated, but the Chicago Tribune is reporting that festival organizers will announce Wednesday that 70s heavy metal pioneers Black Sabbath, the Red Hot Chili Peppers, the Black Keys and Jack White will headline the Chicago event, August 3-5.

In typical Lollapalooza fashion, the complete lineup blends genres over three days in Chicago’s Grant Park, but it could provide a few clues for bands on the festival circuit that could be included in the Outside Lands 2012 lineup announcement later this month. Expect to see Jack White in Golden Gate Park this August after he tours Japan in late July, and Santigold, Justice and up-and-comers FIDLAR would also be great additions. It would be nice to see a complete change of pace from the granola-friendly lineup last year with Black Sabbath and local favorites Metallica topping the bill, but I’m guessing we’re more likely to see The Boss than bat-shit crazy Ozzy. It’s anyone’s guess at this point. Who would you like to see?

Lollapalooza Lineup (in no particular order)

Avicii, Justice, At the Drive In, the Afghan Whigs, Miike Snow, Bloc Party, the Temper Trap, Delta Spirit, Childish Gambino, Doomtree, Macklemore & Lewis, Weeknd, Frank Ocean, Michael Kiwanuka, Gary Clark Jr., Alabama Shakes, Tune-Yards, Sharon Van Etten, Florence + the Machine, Passion Pit, the Shins, Sigur Ros, Fun., M83, Franz Ferdinand, Metric, Dawes, the Temper Trap, Die Antwoord, Mona, the Growlers, the Gaslight Anthem, Hey Rosetta!, JEFF the Brotherhood, Band of Skulls, Anamanaguchi, SBTRKT, First Aid Kit, Tame Impala, Wax, the Walkmen, FIDLAR, JJ Grey & Mofro, LP, JC Brooks & the Uptown Sound.Milo Greene, Neon Indian, Dum Dum Girls, Kopecky Family Band, Washed Out, the Jezabels, Aloe Blacc, Trampled by Turtles, Yuna, Bear in Heaven, Walk Off the Earth, Blind Pilot, Animal Kingdom, Chairlift, Dev, J. Cole, the Black Angels, the Sheepdogs, Yellow Ostrich, the Dunwells, GIVERS, DJ Mel, Polica, Empires, Bombay Bicycle Club, Kevin Devine, Wale, Dry the River, White Rabbits, Helena, Haley Reinhart, Imaginary Cities, the Head & the Heart, the Devil Makes Three, Overdoz, the Big Pink, Oberhofer, Ambassadors, Twin Shadow, the War on Drugs, DJ Zebo, the Tallest Man on Earth, Chancellor Warhol, Toro Y Moi, O Rappa, Laura Warshauer, Dr. Dog, Bowerbirds, Red Oblivion, Of Monsters and Men, Orchard Lounge.

Perry Farrell’s Stage

Bassnectar, Santigold, Skream & Benga, Totally Enormous Extinct Dinosaurs, Kaskade, Little Dragon, Star Slinger, Calvin Harris, Porter Robinson, Nadastrom, NERO, Sub Focus, DJ Nihal, Madeon, the White Panda, Knife Party, Zedd, SALVA, Zeds Dead, Paper Diamond, Kid Color, Big Gigantic. (via Chicago Tribune)