I'm not sure that this was posted here before. If it was, I ignored it.
Some of the themes they mention sound kind of cool, but the only thing in the video that actually matches them is one piece of concept art that shows a large demon skeleton. I'd like to play a game wherein I move through corpses of monsters the size of buildings, but it will probably never actually get that bizarre in this.
The original Doom games were like the Native Americans in that they used every part of the level. Everything was utilized and connected so that what you were playing through felt cohesive. If there was an enemy in the distance or in a window, you could probably find a way right up to that enemy, and then you'd be rewarded with some sort of secret goodies that it was guarding. In regard to movement and exploration, the skybox was the limit.
By contrast, it seems like the best case scenario in this is that we'll get some cool giant corpses and bizarre landscapes, but they'll just be part of the background. There will be a corridor, or possibly two, that connects a couple of NeueWolf-style kill rooms, like the one in the Hell E3 presentation, where you just sit around and kill everything that spawns, and then go through the door that magically unlocks afterward. You won't get to explore shit about it.
Contrast this with E4M2 (Perfect Hatred), which is probably just a bit bigger than that same E3 showcase arena, really, but it works in so much more. It's multi-level, despite the engine technically not allowing multiple levels. It requires finding two keys. It has Cacodemons that roam around and potentially block your way through smaller doorways. It sends you through the same spawn area like four times, and each time is different. It trolls you with a Cyberdemon that you can telefrag. It doesn't get much better than that!
But then these fuckers aren't even trying...