If there was any doubt that Donald Rumsfeld's book would be frank-and-candid narrative of what, in his telling, really happened, here are a few details about what promises to be a tell-all in the tradition of the Washington memoir. First, see above: The dust jacket depicts a fleece-wearing Rummy at his get-away in Taos, a signal that he's detached from the Beltway and has nothing to lose. Then there is the title, "Known and Unknown," a play on his famous formulation about "known unknowns" and "unknown unknowns." That's shorthand for suggesting he's going to reveal more than a few...