Debicki will take over the role from Emma Corrin, who will play a young Diana Spencer on the drama's upcoming fourth season.
Colman won this year's best actress Academy Award for her role as Queen Anne in "The Favourite" and will next portray Queen Elizabeth in season three of "The Crown".
Mullah Abdul Ghani Baradar's lead role in peace talks with US envoy Zalmay Khalilzad is considered significant because of his stature within the Taliban, which controls or holds sway over nearly half of Afghanistan.
Diversity, though, was the biggest winner when a black filmmaker won his first competitive Oscar, a superhero blockbuster set in Africa scored big, and two black actors and an Egyptian first-generation American won three of the four acting prizes.
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