This is according to Olympus America's DSLR product manager Richard S. Pelkowski:
"I would say that within 24 months the E system will not have a mirror box at all. Up until we launched the Pen cameras all manufacturers were doing was fitting a digital sensor in what is ultimately a film camera body – there was nothing different. But with digital and electronic technology we can make cameras so much smaller. Soon the AF system in the Pen cameras will be as fast as that in the E system DSLRs so there it will be possible to get just as good AF performance without the mirror system. We have a great range of lenses for the Four Thirds system, and they're not going anywhere, but they will be used on smaller and lighter more modern bodies."
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