NEX Rumors !!

There would have to be something special about them to offer a system capability that cannot be easily be done with APS-C NEX cameras/lenses. I expect they would be premium priced like he 24mm or even more so - the RX1 is I think a good indicator here of how a FF NEX+prime combo would be priced.

This depends on who you think the customer will be.

Sony doesn't make money when people use adapted lenses -- unless they are Sony lenses.  A company really wants to get those additional lens sales.

Sure, with an LEA-2-type adaptor.  But then Sony begins competing with their own A99, RX-1, and the VG series. Note that Sony (and to a small extent Canon) are the only companies whose mirrorless offerings directly compete with a their DLSR product line.

Exactly why I would suspect a higher price: Sony needs to make money assuming fewer lens sales.

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Erik