Series creator Peter Morgan has always said that he meant to replace key cast members in later seasons, to better portray the main characters as they age. Both Bonham Carter and Colman have previously played the Queen Mother on film, played in the show by Victoria Hamilton up until now, with Bonham Carter receiving an Oscars nod for the performance in The King's Speech.
It's being reported that Netflix is close to a deal with Carter to join the third season, which will already be switching leads as Claire Foy gives way to Olivia Colman playing the older Queen Elizabeth II.
The Crown won't be Bonham Carter's first time joining the royal family onscreen. Though Netflix has yet to confirm, an exciting new contender has popped into the conversation: Helena Bonham Carter.
Vanessa Kirby and Matthew Goode as Princess Margaret and Lord Snowden. And we think the kooky actress would be spot on in the role as royal tearaway Margaret.
Claire Foy has played the Queen for the first two seasons, and earned an Emmy nomination as best actress for her work.
The Crown season 3 could premiere as early as this fall, but we wouldn't be shocked if it is pushed back later to accommodate all of the changes.
The second season of The Crown brought shades of infidelity, power struggles, and plenty of royal drama, and we know from real life that there's even more to come.
Hopefully, there are some more castings announced in the days ahead; we know that for us, we're very much curious to learn precisely who could be starring in the role of Philip.