I talked with the rep about EFC and ES, he didn't seem to fully understand the impact of such an acheivement.
The menu was set to german, so I suppose the translation might not be totally correct:
There are indeed three settings, which I would describe as:
- mechanical shutter
- mechanical and electronic shutter (=EFC; you could hear the shutter closing at the end of the exposure time)
- electronic shutter only (=ES; totally silent)
The rep clearly stated that is was still a beta firmware, but already far developped.
I own a IQ3 100 myself and am very convinced about the advantages of an EFC / ES for certain types of photography. As a landscape photographer I couldn't be happier about this developpement.
Best
Jost