PepsiCo (PEP +0.8%) launches the first new ad campaign for its flagship Pepsi-Cola in three years. The soda has slipped to no. 3 in the cola wars behind Coke (KO +0.8%) and Diet Coke while the company turned its attention to healthy-foods initiatives. Analysts have accused PepsiCo CEO Indra Nooyi of taking her eye off the company's biggest brand.