Reagan and Castro
But some pre-publication excerpts have made it into print already, courtesy of the latest issue of the magazine Vanity Fair.
According to news reports, the diaries show Reagan at his most candid - about his own private life as well as affairs of State.
Including events in Cuba …
"Intelligence reports say Castro is very worried about me,” the late president wrote in February 1981. “I'm very worried that we can't come up with something to justify his worrying.”
More than 25 years later, has anything changed?