0) Touch screen a la leaf, but with brightness at the level of the iPhone.
1) Real time preview, instantly usable without the need for filters etc.
2) ISO capabilities comparable to Canon EOS 1Ds II
3) High speed wireless networkable
4) In built flash memory (I know some have it already) sufficient for a days shooting with the abilitiy to shoot simultaneously to CF card and the in built flash.
5) 60Mp sensor with selectable 30Mp and 22Mp modes for different kinds of end usage.
6) (The crazy one) Full frame 6x6 or 6x7 sensor for a more 'MF' look.
7) Cost at comparable price to current 1Ds II/III
On board image processing allowing lens characteristics to be handled on board, eg for use on MF cameras to cure barrel/pincushion distortion
9) Open firmware with 3rd party plug in API for image processing.
10) Vendor provided software all at the minimum level of that provided by Canon or Phase-One
11) Committment to open architectures and software at all levels to provide investment protection.