At the bare minimum, I want real lens interchangeability. I'd prefer a
Leica screw mount (just so I can use what I have), but realistically, a C
mount (or even D) would be more practical. But ANY MOUNT!
What I REALLY want to see, is a 24 x 36mm imagining sensor mounted in a
35mm wide x ~1mm thick assembly, connected by a flexible 35mm wide to a
cylindrical housing for batteries, circuitry, etc. Then it could be a
drop-in retrofit for use with REAL cameras.
I've seen a few medium format (4 x 5) film pack conversions, but they are
WAY too expensive, and don't have enough resolution to warrant their
size. (anything less than 10 megapixel would be better suited for 35mm)