Michael Michele cast as Dominique Devereaux on Dynasty

-The role was originated by Diahann Carroll on the 1980s series
-Her character is the Colby family matriarch and half-sister of Blake Carrington
-She will be introduced as a recurring character at the end of this season, and might be a regular in season 3
-"Dominique is home to reconnect with her estranged children" after attempting (and failing) to seek fame in New York City

She's been tweeting her looks for the show:

Source 1 / Source 2 / Source 3