The speculation that George Stephanopoulos will replace Diane Sawyer on Good Morning America is true, Politico reports. ABC News will announce Stephanopoulos as the new anchor on Thursday and he could join Robin Roberts behind the anchor desk as soon as Monday, according to Mike Allen. Sawyer has her last day on the show on Friday, and will begin to anchor World News on Dec. 21. In the meantime, Stephanopoulos may be keeping his Sunday show This Week for a transition period, as network brass don’t want to mess with something that is doing well. Eventually, a new This Week host would be named.