ABC made it official on Thursday, announcing that George Stephanopoulos will replace Diane Sawyer as anchor of "Good Morning America," while Juju Chang will be made news anchor.

Former "GMA" anchor Chris Cuomo has been promoted to "20/20" co-anchor alongside Elizabeth Vargas. Sawyer has been promoted to anchor of the ABC nightly news.

"I can't wait to join 'Good Morning America''s amazing team, and serve its loyal viewers," Stephanopoulos told ABC of his new gig. "No one can replace Diane Sawyer, but I'll do everything I can to match her unquenchable curiosity and intense commitment to informing the country every morning. What an adventure."

"I am so excited to welcome George and Juju to our family," "GMA" anchor Robin Roberts told ABC of the news, "The energy and talent of those on camera and behind the scenes at this program are second to none. I have no doubt that George and Juju will immediately feel right at home. Saying goodbye to Diane has not been easy, but I'm glad she will finally be getting more sleep."

Stephanopoulos, who has been ABC News' chief Washington correspondent since 2005 and host of "This Week with George Stephanopoulos" since 2002, will continue to host "This Week," until ABC lines up a replacement. Chang, an Emmy winner for California wildfires coverage, has previously worked for ABC News as a correspondent for "GMA," "20/20" and "Nightline."