'Gravity' director Alfonso Cuaron and 'Star Wars' helmer J J Abrams will present special early announcement of 11 categories.
Actor Chris Pine and Academy president Cheryl Boone Isaacs will present nominations in 13 categories, including best picture.
"Each of the three years we've produced the show, we have attempted to refresh elements of the process and the telecast," said Zadan and Meron.
"This year, we're honored to start a new tradition that celebrates the contributions of all the nominees by announcing all 24 categories. We're thrilled that a distinguished actor and two world-class film directors are part of the initial launch," they added.
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Pine and Boone Isaacs will take to the stage eight minutes later to unveil the nominations for Best Actor, Best Actress, Best Supporting Actor, Best Supporting Actress,Cinematography, Costume Design, Directing, Foreign Language Film, Makeup and Hairstyling, Original Score, Adapted Screenplay, Original Screenplay and Best Picture.
"We're delighted to have Chris, Alfonso and J J participate in the excitement of nominations morning, which, for the first time, will highlight nominees in all categories," said Boone Isaacs.