Just found out about
Apertus, an "open source cinema camera". Their mission statement is "We intend on creating an affordable community driven free software and open hardware cinematic HD camera for a professional production environment."
Shoots 1080p proprietary RAW at 30.9 fps (?), has C-mount lenses (CS with adapter), and get this: shoots
only progressive video!
More cut-and-paste:
The camera uses an Aptina CMOS bayer-pattern sensor with an optical format of 1/2.5" (5.70mm x 4.28mm) and a native resolution of 2592x1944 (5 Megapixels). It features a 12 bit ADC and supports: region of interest, on-chip binning and decimation. Aptina claims that the chip has 70db of dynamic range at full resolution and 76db when using 2x2 binning.