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A full frame system camera like setup. I mean, several top notch components that could be assembles to a highend SLR, just as well a mirrorless type. That, combined with a full set of various adapters to the mirrorless box would help Sony to attract lots of users from the competition and give the camera access to all kinds of system component of the competition at once. Imagine a full frame NEX 7 like box, with an SLT adapter to make it a SLR. If Sony brings "sensor boxes" with different types of sensors, a 24mp a 36mp a 12mp with different characteristics (obviously resolution and filesize, but DR, noise and ISO performance as well), they would have the best (semi-) open system camera at once. This would be a great offering for professionals. I know this kind of thing is not likely to happen with Sony's corporate proprietary technology philosophy. But I have been amazed about their NEX cameras so far and they have in fact all the elements, techology and marketing, in their hands. If they want to be the new marketleader above Nikon and Canon, this is their chance.