Woah look at that! The first GSoC project just landed :)
This shader is an implementation of the paper by Chiang et al., which was used in the Disney film, “Zootopia”®. Documentation is available here.
Landed in both master and Blender 2.8. Will it come to EEVEE? Eventually parts of it can be made compatible but it won't look the same as this is quite raytracing heavy.
Artwork by Chris Chuipka, thanks!