Through Turmoil and Tragedy, a Peppy News Pro Wakes Us with a Smile Premieres: Jan. 4, 9 p.m. Encores: Jan. 5, 12 a.m.; Jan. 6, 8 p.m. She hates the P-word, but you can hardly describe Katie Couric without saying "perky." For millions of Americans, she and Today cohost Matt Lauer represent a human jolt of caffeine. Yet for all her cheeriness, she has been lauded as one of the best in the business, slipping easily between serious topics and infotainment. Catch this E! True Hollywood Story, when it premieres Sun., Jan. 4, at 9 p.m., and see how Couric...