You’d better watch this in 4k, or to the best resolution your screen and internet connection can support:

More than 1 billion triangles in the original model each frame crunched down to 20 millions, all rendered in real time. Most of the triangles are so small that they end up being one pixel. This requires shadows to be pixel accurate as well. All lightning in the demo is dynamic. No lightmaps! No normal maps. No LOD. My head is spinning. Audio rendering is not left behind neither.

A commented version by someone who actually understands the depth of what is going on:

Amazing piece of technology. Things are moving so fast I wonder how this blog post will look like 5 years from now. Probably very outdated.