The network said it would announce the lineup at the Los Angeles Forum, an arena where auditions will be held ahead of the show's Season 10 premiere in January.
Singer and actress Jennifer Lopez and Aerosmith rocker Steven Tyler are reported to have signed up for the panel in a major overhaul aimed at reversing a four-year slide in viewership.
Lopez, 41, star of movies "The Backup Plan" and "The Wedding Planner," was widely reported earlier this week to have signed a $12 million contract with "Idol."
Rock and Roll Hall of Famer Tyler, 62, would add some serious cachet to the singing contest, which launched the Grammy-winning careers of Kelly Clarkson, Carrie Underwood and Jennifer Hudson.
Record producer Randy Jackson is expected to keep the seat he has held since the show debuted in 2001.
