The third season will reportedly pick up with a time jump to the 1970s ― Season 2 ended in 1964 ― and introduce Camilla Parker Bowles, then known as Camilla Shand, as well as explore the dissolution of marriage between Margaret and Lord Snowdon. "That informs everything we do".
Also reportedly joining the Season 3 cast in this new incarnation of the cast is Helena Bonham Carter.
The award-winning star was being eyed up to play Elizabeth in the show following the departure of Claire Foy but bosses decided she'd be better suited to Margaret while Olivia Colman will play the matriarch.
For Carter, playing a member of the royal family is not entirely new territory.
Carter's most notable roles include an Oscar-nominated turn in Tom Hooper's The King's Speech opposite Colin Firth and an unforgettable character in David Fincher's Fight Club opposite Brad Pitt and Edward Norton.
With the first two seasons spanning approximately 20 years (each season taking place over the course of 10 years or so), it's reasonable for the older actors to take over - and the transition shouldn't be too jarring, with the show making emphatic efforts to subtly age up the original cast as the episodes have gone by. Seasons 3 and 4 have not been officially ordered, but early production is said to be underway.
The Crown's historical consultant, Robert Lacey, spoke to Town & Country about what the audience can expect from the upcoming season.
Vanessa Kirby and Matthew Goode as Princess Margaret and Lord Snowden. "I was utterly gripped watching it", Colman said in a statement. "There are things beyond that I would have loved to have played, like [Princess Margaret] got morekind of sassy and even more outspoken and more demanding and aggressive in some ways".
Lord knows she can already hold a cigarette like Margaret.