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The rumor is that the next OM-D will be a 'pro' OM-D, and will natively take both 4/3 and m4/3 lenses. Whether it does this internally somehow or via a mirrored adapter I'm not sure. I would imagine it will be a Micro 4/3 camera with PDAF on sensor and the ability to use the 4/3 lenses via adapter at their native AF speed, but maybe it's more unique than that. There is some awfully good 4/3 glass, especially at the long end.
In the wide to medium telephoto range, I think it makes a lot more sense to use the native m4/3 glass due to size and frankly how good it is...but lenses like the 55-200 SWD and the 150mm f/2.0 would be awesome to use with m4/3 if they could focus as fast as a native 4/3 cam.