So there’s more info trickling out.
It appears the Sonore opticalModule is basically Sonore’s attempt at an FMC (ultra low noise everything, everywhere in the circuitry).
But it’s the Sonore opticalRendu that’s more interesting to me with it’s fiber input (not as interesting as a fiber input DAC but the next best thing I guess).
I’m happy with my modded low noise (5Vdc battery powered) FMC’s but for some people, a Sonore opticalRendu cuts down on boxes and number of quality PSU’s needed before the DAC. Not that anything is needed before the DAC - but we’re here in the FMC tinkering section, so this is a place for tinkerers 
Some new info on the opticalRendu: