Season 3 has yet to premiere and already Netflix has added Gillian Anderson to The Crown's season 4 cast. The upcoming third season will feature an all-new cast as the fictional Queen Elizabeth II and her family grows older and years go by. As such, Oscar-winner Olivia Colman will take over for Claire Foy as Elizabeth; Tobias Menzies will play Prince Philip, a role originated by Matt Smith; Helena Bonham Carter steps in for Vanessa Kirby as Princess Margaret; finally, Ben Daniels will play Margaret's husband, Antony Armstrong-Jones, first played by Matthew Goode. [caption id="…