Cold Stone Creamery has announced the launch of the Cold Stone Yogurt Bar, a new yogurt concept that will be incorporated into existing Cold Stone stores in 2011. The yogurt bar offers self-serve weigh and pay frozen yogurt with a full toppings bar. Over the next few weeks, several stores in Arizona, California and across the east coast will incorporate and test the yogurt concept in preparation for an intended nationwide launch in the spring of 2011.