Revealed shortly before the shooter RPG's release, 'Dr. Ned' is a described as a "full-fledged expansion" which adds new areas, quests, undead enemies and rare loot.
While no release date was announced for a PC release, a posting on the Gearbox Twitter confirms that the ghoulish DLC "will come to PC." Another explains there is yet "no... ETA" on the upcoming patch for the PC version, "but it is being worked on (long hours and weekends, too)."
Source: Shacknews