Heard about this a couple of months ago and the Atkins website did have an article for a while (might still be there, but I haven't looked in a while) about how you could get a refund for any of the old bars that may have been purchased. You did, however, need to produce a cash register receipt with the price of the bar circled in order to get the refund.
Atkins wasn't the only one in that lawsuit. Looks like they pretty much went after anyone who didn't include, glycerin, fiber and sugar alcohols in their total carb counts.