That Aaron Sorkin-penned HBO pilot about cable news just keeps getting better. Joining Jeff Daniels, Emily Mortimer, Olivia Munn and Alison Pill in the cast is veteran television actor Sam Waterston.

Last seen on television when Law & Order signed off the air in 2010, Waterston will play boss to Daniels' newsman. Mortimer—who's deal is still not completed—will co-star as the executive producer, while Munn and Pill will play an on-air correspondent and associate producer, respectively.

The show—which is tentatively titled More As the Story Develops—is already one of the more highly anticipated pilots of the year, and this casting decision just pushes it higher on our most-anticipated list. Can HBO just make this a series and get it over with?

[via TVLine]