Katie Couric has a "major announcement" to make on the Today show, um, tomorrow. The one-time host of the show and current embattled CBS News anchor was replaced by Meredith Vieira, who sounds none-too-pleased about Couric's return. Then Matt Lauer makes a sex-change joke. Then Meredith says "we have sex." Then the clip ends. Yikes. Also, what's Katie's big news???