In order to present advertisers with a solidified schedule during its "upfront" market presentation in mid-May, NBC is considering releasing Katie Couric from the contractual prohibition barring her from negotiating with other networks until her contract expires on May 1, the Wall Street Journal reported today (Monday), citing people familiar with the matter. The newspaper also said that if Couric decides to accept an offer from CBS to become its anchor for the CBS Evening News, she will likely be replaced on Today by one of three candidates -- Campbell Brown, host of Weekend Today, Natalie Morales, who appears on the third of Today, or Meredith Vieira, co-host of ABC's The View.