If you\'re looking for a camera that gives you extremely high latitude, recording in a format that preserves the high bit rates, in HD or higher resolution, with a form factor similar to other digital cameras, the closest I\'ve seen is a prototype that Sphereon VR showed at Siggraph:
http://www.spheron.com/en/company/downloads/press-releases/details/article/...
It has its own issues, most notably that there are no helpful workflow tools to take 32-bit (I think) HDR image sequences into video tools (NLE, color correctors) that only deal with 8 or 10 bit video...
But as was mentioned, the existing best option is to find the camera that will capture a high latitude and write it to a proper video format, like RedRAW, ArriRAW. None of these existing cameras can capture true HDR at 24fps to my knowledge, so it depends on what exactly you need to accomplish...
prehistoricdigital.com
hardworkingpixels.com