He also did a live coding demo showing off this VR scripting concept. Having such a fast iteration cycle is very compelling. Hopefully at least some Javascript version of this will exist, even though this seems like a perfect application for a Lisp.

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

I wish he did live coding. Jonathan Blow's Twitch channel (naysayer88) is very compelling. Carmack's would be as well.