You are right about the 2015 publication. I believe ORNL waited until it had results from a user (Fermilab) to release the information. There are also two related papers: -- one is about the Fermilab's neutrino research using MENNDL http://ieeexplore.ieee.org/document/7966131/ -- and the other is about evolving deep neural nets in HPC: https://dl.acm.org/citation.cfm?doid=3146347.3146355