Wolfenstein Deluxe was a Wolfenstein 3D mod, made by BlackhawkX and Valiance as Dynamic Entertainment.
The mod was supposed to be a complete overhaul of the original game, featuring all-new objects, walls and sounds. Coding was most likely implemented as well, with a particular lighting effect being mentioned on their website. No screenshots or download links survive, though.
There is a chance that the mod was not released in this stage, however, and morphed into Project X1.