"The Double Down launched originally in April 2010. It was a huge hit with fans, with more than 10 million sold in the first month, so it stayed on the menu past its original late May 2010 promotion-end date," the company told Eater. "Many restaurants continued selling Double Downs throughout 2010. It has not been nationally promoted in four years."
The company will reportedly be rolling out a media campaign for the official announcement called the "Double Down Dare." Stay tuned for details on that one.