https://twitter.com/romero/status/688054778790834176

This, right there, should become a new trend among legendary game designers.

EDIT: Just beat it. It's a very cool reimagining of E1M8 with some really tough battles against imps, sergeants and pinkies. Really nice for just a warmup practice for his new FPS.
It won't work on vanilla through dosbox, as those cracks are visplane overflow city material.

Same with Chocolate, obviously. Crashed in the first room with R_FindPlane: no more visplanes.
Meh. What's the DOOM of choice for non-purists these days?

The text file in the zip says it has been tested with ZDoom and Crispy Doom. Crispy Doom is Chocolate with higher resolution and limit-removing, so that's your purist choice for this map. Alternatively, PrBoom+ is a good purist choice too.

For non-purists, well, ZDoom, GZDoom, or Doomsday.

It should work fine in pretty much every limit-removing source port out there.

Just beat his level, it is awesome.

The cracks inparticular really push you to keep moving fast, right into a flood of monsters LOL. Good stuff.

Someone ported this level to the Sega 32X version. Unfortunately, content did have to be cut because the original level was too big for the 32X to handle.

https://www.youtube.com/watch?v=RXfx3LzUZio

And now he has released a second. E1M4b this time.
http://www.pcgamer.com/john-romero-releases-another-new-doom-wad/?utm_content=buffer380ca&utm_medium=social&utm_source=facebook&utm_campaign=buffer_pcgamer

Wiki links to the maps:

http://doomwiki.org/wiki/Phobos_Mission_Control
http://doomwiki.org/wiki/Tech_Gone_Bad