As of a few minutes ago, USFSA has caught up and made its own announcement: http://www.usfsa.org/Story.asp?id=48896&type=media
LYSACEK WITHDRAWS FROM 2013 PRUDENTIAL U.S. FIGURE SKATING CHAMPIONSHIPS
(1/18/13) - Evan Lysacek, the reigning Olympic champion, announced today that he has withdrawn from the 2013 Prudential U.S. Figure Skating Championships, which will take place Jan. 20-27 in Omaha, Neb.
Lysacek, 27, who had surgery in November to repair a sports hernia, has been training in southern California with Frank Carroll and Karen Kwan-Oppegard.
"It's disappointing because health-wise I'm fine," Lysacek said. "Due to the long layoff from the surgery I still need about three more weeks to get back into competition form. The good news is I am finally healthy, back to a full training schedule and already working hard to be ready for next season to defend my Olympic title at the 2014 Olympics in Sochi."
In addition to winning the 2010 Olympic Winter Games gold medal, Lysacek is the 2009 World champion and a two-time U.S. champion (2007, '08).