Black magic just announced a cool new camera for what what appears to be getting cinema level shots from a slightly bigger than gopro package. Expensive, but super cool. Stoked to try it.
Its a 16mm sensor with 13 stops range and uses an active mount mirco four thirds lens mounting system, which means it can use...pretty much any lens with an adapter. a cheap bower/rokinon 7.5mm fisheye give you a decent 22mm (35mm equiv.) field of view and would be light easy to mount just about anywhere. Very cool.