That video was such a tease. First of all what kind of kind of game engine can run all of this at a normal speed.
I find it hard to believe that what this video advertises is real. But, if it is, it is a massive leap in progress for the 3D art world. Too big actually. I don't think any real-life render or super-high-poly mesh would ever actually utilize more than 5% of this technology. The people who create these models are human, and it is just inhuman to come even close to the tri count of what they are advertising. But in some ways this could be real. I'm no one special, but I actually think that depending on their method, it might be simple to create "animations". Say you have a volume of "cloud stuff". Let's say it's a 1 mile by 1 mile block .Just like voxels which can be turned into "air", you could turn swaths of indexed particles on and off to give the appearance of motion. A moving ball then becomes a ball that "teleports" a number of units equal to its speed, in a direction appropriate to its current vector. But what do i know...