If the 4K body was this close to release then wouldnt it have made sense for Canon to show/tell more about it at the C300 launch? I got the impression that it was still some way away and was included only to counteract RED's release.
I been lurking this site for a while now and felt it's obvious that most aren't cinematographers/videographers because many don't understand the C300's purpose and feel that the 4k DSLR will be undercutting the C300. Which is understandable, these cameras are photography cameras first.
I finally took the time to register for the site (YAY!). I'm a filmmaker and I'm looking forward to the new 5D and the 4K DSLR camera.
The truth is the Canon C300's market is for Broadcast and professional event videos, not film. Sure it can easily be used for film and if you have it, I say use it for that as well (1080p is still dominate, and it's amazing in low light). However, the C300 is built around meeting the broadcast requirements not the needs of filmmakers. With that being said, the announcement in Hollywood truly confuses the audience. They should have announced it in a different way.
The 4k camera seems to be targeted towards filmmakers. I expect it to have a recording limit like our current DSLRs have. This isn't much of an issue for filmmakers because rarely is take 12 mins long. Most are under a minute or so. Films require more resolution than broadcasting (1080p).
Canon can justify both cameras being available. If I was mainly a wedding videographer I'll go with the C300 for its recording time, battery life, and for its impressive 1080p resolution (don't need 4k for weddings). For my films, I'll go with the 4K DSLR. Mainly for 4K (so we can have amazing resolution that allows you to sometimes be able to re-frame in post), 10-bit (Canon knows we want that) for color grading, and mobile form factor.
That's the way I see it. Loving the info you guys are providing. Keep it coming.