Charlie Intel, courtesy of user @syncohboyy, recently got its hands on what look to be data files for weapon DLC in Call of Duty: Ghosts. The files plainly state "dlcweapon" with a number designation following each, as well as a list of weapon attachments. If true, this would be the first time an Infinity Ward-made Call of Duty gets weapon DLC, as Modern Warfare 3 was tasked to its memory capacity.
Last year's Call of Duty: Black Ops 2 was the first time weapon DLC was introduced to the series, though the memory limitations of current-gen hardware meant that the Peacekeeper SMG would be the only weapon added. If these supposed weapons follow suit, you can expect more info alongside the map pack reveals.
PC game files for Ghosts hints at possible weapon DLC [Charlie Intel]