This is a developing story based on leaks occurring on 4Chan: https://boards.4channel.org/v/thread/598358716

The few of us left who still follow Duke will understand the nostalgia and sheer joy that is felt to see and read this stuff.  If what is being said is true (and we’re willing to bet on it) and there is a playable game released, perhaps we will, for a short time, rejoice in a collective reunion of the thousands of fans that were with us during the 3D Realms days before 2009.  Imagine, for a second, if they got together to rebuild the game the way they created DNF 2013 inside Duke3D.

Here are relevant quotes from the person(s) known as “x0r” who is/are posting the content below:

Almost every chapter is present in some form. A huge chunk is playable, a huge chunk is block-outs with no enemies. All of the E3 content is there.
Not just the editor, we will be releasing the full source code too.
All weapons are functional with the exception of the chainsaw and the freezer.
Do you have any date on when you are gonna leak it then? June.
The editor works. We also have the engine and UnrealScript source code and have written instructions for compiling it.
Two builds, but only the content for one.
It is Unreal Engine 1, like the final game.
There is no complete game. It was never finished.
The E3 2001 iteration but not the E3 2001 build.
The shrink ray is in the game, it’s the first weapon in slot 4.
The theme is just the Megadeth version. It starts playing as soon as you boot the game.
Bombshell is not visually present in the game at this point, there is a log file showing that her model was deleted.
The strippers can be seen and interacted with when you first enter the club. By the point in the game that was recorded, most of them are dead.