Couric, who was speaking during a Q&A session with "60 Minutes" correspondent Lesley Stahl, added that she "resents" being asked how difficult it will be to make the transition from the "lightness" of morning news to the more "sober" evening news.
"Anyone who watches 'Today' knows that I've done more hard-hitting interviews than any evening news anchor," she said.
"There's an awful lot of work to do," McManus said. Viewers will see some changes when Couric joins -- including a new set, graphics and music -- but any changes "may not be revolutionary" and the broadcast will "evolve over time.""Dramatic differences might impress a lot of critics, but they also will alienate the core group of viewers who still watch every night,"