Let's take a look at what will happen when Prince William becomes king
reports that Charles has told aides he fears Harry's book will be an "excoriating takedown" of Camilla, and that he's also expressed his concerns to Prince William. But apparently Wills doesn't want to get involved, and likely won't follow through on Charles' request that he "go in and bat for Camilla" publicly if Harry writes about her in the memoir.
Meanwhile, "Charles is deeply protective of Camilla. The last thing he needs—especially in a year of celebration that should be all about the Queen—is an excoriating takedown of Camilla at a time when people have finally taken her to their hearts." Harry has in no way indicated that Camilla will be part of his memoir, so the royals can probably chill for now!