Found this blurb. Sounds like the TMZ special might be a bigger deal than I realized. Seems to hint that Elizondo and Mellon will be interviewed, among others, unless they just show clips of previous interviews.
"TMZ Investigates: UFOs - The Pentagon Proof (8 p.m., Fox) - In this one-hour special, TMZ analyzes the U.S. government's official response to UFO conversations from an investigative standpoint. The special will walk viewers through UFO footage, including a never-before-seen video of UFOs from the deck of a USS naval ship, and speak with some of the people who experienced it firsthand. Interviews will feature senators, military pilots, a Harvard scientist, former Pentagon officials and the two people who pushed the government to release information it has held secret for more than 70 years."