The latest updates are expected to cover the couple's explosive Oprah interview , allegations against Meghan over the bullying of royal staff , which she denies, and Prince Philip’s death.
The new edition is also said to take in their new life in America, their multimillion-pound deals with Netflix and Spotify and the Queen’s decision to strip them of all royal patronages earlier this year.
Readers can expect it on sale from August 5, when it will likely cause even more tension within the Royal Family, particularly between Harry and William.
The brothers were reunited for two hours after the Duke of Edinburgh’s funeral — sparking hopes of peace between them.
But further revelations could impact any progress made.
Finding Freedom tells how Meghan and Harry left the Firm in 2020 Credit: Publisher A senior courtier told The Times: “The Oprah interview detonated a bomb under the royal family and most of them are still reeling in shock.
"The book will not help.”
Another senior royal source added: “After Oprah, what else is there to say?”
Published last summer, Finding Freedom covered the period from 2016, when Meghan and Harry met, to their exit from royal life and move to America last year.
It said Harry was “pissed off” with his brother, who he felt behaved like “a snob” when he advised Harry to “take as much time as you need to get to know” Meghan.
In the book, Meghan was also said to be “disappointed” that the Duchess of Cambridge wasn’t “welcoming enough”, while Harry believed the Prince of Wales valued his image over his relationship with his son.
Authors Durand and Scobie said they had “unique access” to those closest to the couple.
The Sussexes, however, have denied collaborating with the book, which was being sold on Amazon for 99p just five months after it was published.
Oprah surprised Meghan Markle and Prince Harry went 'all the way there' in bombshell interview