Sorkin's project, tentatively titled "More as This Story Develops," centers on cable news anchor Will McCallister, to be played by Daniels, as well as the show's female executive producer and staff.
Pill has signed on to play Maggie, an associate producer on the assignment desk, and Munn will play a "sexy financial analyst" on the same cable network as McCallister.
Pill was nominated in 2006 for a Tony Award for her performance in Lieutenant of Inishmore, and has also been seen in The Miracle Worker and Mauritius.
Daniels was nominated in 2009 for a Tony Award for his performance in God of Carnage. He has also been seen in Redwood Curtain and The Golden Age.