For me personally, the DLC release was pretty unexpected news, because I actually forgot the game even exists, so now, it might be a chance to bring back at least the fans of the original TV show.
In this DLC, we will be able to play three new story chapters as Rick Grimes, Daryl Dixon, Michonne, and Negan in The Walking Dead universe.
Each story chapter will have its own location, unfortunately the order is not confirmed, but on the official resources it is always like: the Prison, Alexandria Safe Zone, and Grady Memorial Hospital
The DLC will also bring new melee weapons, new enemies, and gun skins.
I think the success of this DLC depends heavily on the price, because I am afraid that a crossover with such a popular TV Show back then might cost a bit. It can also just be a top manager trying to rip off fans, especially when there aren't really many competitors now, after the failure of Killing Floor 3 (not saying it is a bad game, just not great).