After silence for a good while, I thought they were done with this project, but apparently not. Additional effects, a lot of optimizations, and the bosses were added back in.
There is so much grunt behind it now, that in the right configuration it uses the combined might of the Genesis, 32X, and Sega CD processing power all together.
Catching anyone up who orignally didn't know about this: Doom 32X Resurrection is an attempt to bring the Sega 32X version of Doom to its full potential. The game now supports a laundry list of features it didn't before: local coop / deathmatch, link cable multiplayer, all the maps, sprites from all angles (they all used to face forward, even rockets), positional sound effects, CD music support, new FM ost by SpoonyBard, improved resolution, improved framerate, additional 6-button configs, and more.
The romhack itself can be found at romhacking.net