Well, it’s more like a tweak pack, if anything.
The new map pack doesn’t actually add any new maps, but it does allow existing ones to be used in other game modes. Laguna Alta be added for Squad Rush mode, while Nelson Bay will be available for Squad Deathmatch.
And that’s about it. Not the most exciting DLC in the world, but it is free, and will add new experiences to the game. It’s due out sometime before the end of the month.