Soufiane Khiat will present papers on the state of the art in material description: https://eheitzresearch.wordpress.com/240-2/ and possibly also https://drive.google.com/file/d/0BzvWIdpUpRx_dXJIMk9rdEdrd00/view
This should be a good follow-up to Jeff's talk on Metropolis Light Transport. Those interested in graphics, physics, or probabilistic methods should certainly attend! I'm sure there will be interesting implementation details, too.
If you aren't sure where to start with these papers, try sections 4 (Insight and Overview) and 7 (Random Walk on the Microsurface) of the first paper.