For the price, you get seven boneless wings, an order of Cajun fries (or side of your choice), a biscuit, and Wild Honey Mustard for dipping.
Popeyes describes the sauce as a "kicked up" version of honey mustard.
While the sauce is meant to be permanent, the $5.99 deal is not. They typically run such deals every month or two.
Photo via Popeyes.