Seems the thread has kind'a left the 1D C, but while I'm all for good stuff cross-pollinating any and all cameras, preferably at a lower and lower price - the 1D C is and will be a niche product, and it seems Canon has clearly made it's mind up about targeting it for the "cinema market" which means the following in my humble opinion:
a) No need for XLR's - Who records "cinema" sync sound to camera? This market is and will be dual system sound, always.
B) 30 fps would be nice to have as an option. It's quite a useful subtle degree of overcrank that seems doable given the specs.
c) 25fps should be added, more as pointed out above because of shooting conditions in 50Hz electrical land, than because of the very small amount of "cinema" being shot at 25 fps.
d) True 24 is a must, as opposed to the "telecine for interlaced NTSC" rate of 23.98. I don't see how they can do without it if they are really going for the "cinema market".
e) It needs some way to jam sync the TC. I could be wrong, but my understanding is that their intended implementation of TC is a rec run or free run of whatever you set the cameras internal clock to using the menu buttons. The best thing would be if the camera's internal clock would be accurate enough to only have to jam sync as a slave every 4 or 5 hours. I have a feeling this will not happen. If so, I would say this would be THE ONE MAJOR shortcoming - possibly paired with the omission of a true 24pfs framerate - that is if they are targeting the "pro cinema market".
My 2 euro cents,
J