The Chicago Tribune is reporting
"Radiohead and Nine Inch Nails are expected to headline the fourth incarnation of Lollapalooza in Grant Park Aug. 1-3." Thanks to Tony L and Laila K. for the news!
UPDATE: Pitchfork is reporting that "Both bands and Lollapalooza say that nothing can be confirmed at this time." Hopefully this isn't a replay of the events of 2004.