The module is scheduled for release in 2015 on PC, with a console release to follow. More is in the works for players before the next module, however; there will be more fixes to the Elemental Evil content, as well as an update before the module featuring guild housing. All of it is exciting stuff for Neverwinter fans.
[Source: Neverwinter: Underdark Coming in 2015]
Neverwinter is heading into a dark place with its next major update. Darker than dark, even. Tenatively dubbed Neverwinter: Underdark, the next module will bring players into the eponymous Underdark, exploring kingdoms of Drow and featuring a questline written by well-known fantasy author R. A. Salvatore. Yes, you’ll be fighting alongside Drizz’t. You knew that was coming, don’t pretend you didn’t.