In February, Coca-Cola announced a seventh addition to its Diet Coke stable: Diet Coke Sweetened with Splenda, which actually features a blend of Splenda and ace-k. On the Pepsi side, Diet Sierra Mist underwent a name change last year. The "shockingly refreshing" lemon-lime taste and formula are the same, but in an effort to help consumers identify it as a soft drink free of sugar, calories, carbs and caffeine, the beverage is now called Sierra Mist Free.