Stick a 4K sensor in that sucker, add video features such as peaking, zebras etc, remove most unnecessary stills stuff (like 61pt AF etc) All for around the $4k mark and I'm sold.
On saying that though, its a hoax and more than likely never happen.
I'd say there is no way it'll do 4k, that would put it competition with the 1D-C. But they could make it the definitive 1080 raw camera. Higher-bit-rate, but way less user friendly than the c300.
Make it the Mustang Cobra to the c300's Porsche.