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