Hmmm, not saying we need this in TG.... but we need this in TG :D
Joking aside, this is nice and shows how machine learning can speed up rendering. It may take a few years until we're there but it looks promising.
Link with video:
https://www.disneyresearch.com/publication/deep-scattering/ (https://www.disneyresearch.com/publication/deep-scattering/)
That was very impressive and yes, Terragen could use that technology.