If anyone is interested in the other papers that are presented at SIGGRAPH 2015, Ke-Sen Huang usually has a complete list with links to preprints and videos. You can find the list for SIGGRAPH 2015 here:

http://kesen.realtimerendering.com/sig2015.html

My favorite paper this year is "The SGGX Microflake Distribution" by E. Heitz et al. Sadly there aren't many papers on rendering this year.