According to Radar on line:
King's pretaped interviews with Oprah Winfrey, Katie Couric, Bill Clinton, and Bill Maher have been pushed ahead to as-yet-unspecified future dates to make room for live coverage of the tragedy. As for tonight's party, it will go on as planned, minus Anderson Cooper, Wolf Blitzer, Soledad O'Brien, Paula Zahn, and the other network talents now camped out in Blacksburg, Virginia. (CNN has roughly 100 employees on the scene.)
Other notables, including Tom Brokaw, Donald Trump, Tina Brown, and Ron Howard, are still expected to attend—even though King himself will have to duck out early to host his show.