Who will be Good morning America co host replacing Diane Sawyer?

As of my last knowledge update in October 2023, there has been no official announcement regarding a specific replacement for Diane Sawyer as a co-host on "Good Morning America." Diane Sawyer has had a long and distinguished career, and any changes to the hosting lineup would be widely reported in the media. For the most current information, it's best to check the latest news sources or the show's official announcements.