You "suspect" these are built by HEC? What caused you to think that?
While I see some similarities between these and the Cougar (HEC-built) CMX-series, I see just as many similarities when I compare them to the Enermax Traithlor ECO units. Similarities to both of those series is strange because Fractal hasn't used HEC or Enermax as an OEM previously -- almost all Fractal PSUs are built exclusively by ATNG. (The initial Integra line was built by FSP.)
I guess we won't really know until: Fractal discloses the information, a unit is opened up and dissected, or they show up on the 80plus.org (excuse me... plugloadsolutions.com) website listings.