A replacement for Couric will be announced during the first week in May, after she returns from London, where she will be covering the royal wedding of Prince William and Kate Middleton.

Though unconfirmed, '60 Minutes' correspondent Scott Pelley is expected to replace Couric following her exit from the program.

Over the past couple of days, news has circulated that hosts Matt Lauer and Meredith Vieira plan to leave the show when their contracts expire. Lauer in particular was at the center of Internet rumors today after reports claimed he had informed NBC executives of his departure, which would be in Dec. 2012.

However, NBC has since denied the reports, saying, "There seems to be an awful lot of speculation around news anchors these days, and it's not our practice to comment on any of it. Matt Lauer has a long-term contract with NBC News and TODAY."