Still no word on what it's called, what it's about, when we'll see it, or if it has even been written yet, but the New York Observer has a small interview with Charlie's editor at Grand Central, Ben Greenberg.
"I've been chasing after Charlie for years," Mr. Greenberg told The Observer. "Without ever having spoken to him. It was just an idea."
Grand Central snagged the novel in a pre-empt, after exclusive negotiations. (Mr. Kaufman is represented by Claudia Ballard at William Morris Endeavor, which also represents his screen work.)
[...] "It was just something that he wasn't going to do until he wanted to do it," he said. (Elliptical! Not unlike a Kaufman screenplay.) (Source)