As a video guy, I want to 5D to be SPLIT into 2 cameras with one that is optimized for video. One of the main reasons for the 5D2 huge success was video, and Canon knows that. It's very obvious from Canonrumors.com, that you cannot make both camps happy with one camera.
Personally, after using the DSLRs I now prefer the form factor over traditional video cameras. The DSLRs are small and so easy to use and are great for stealth shots. Going back to a bulky camcorder would be a real drag.
But I would be happy if they release a Video Camera also (full frame preferably).
I hope Canon does something quick in the video department. They are seriously falling behind Sony and Panasonic, and with Nikon set to release some new cameras, Canon is looking really dated. Sony especially, is really tempting lately and once people switch it's hard to go back, so Canon needs to act SOONER than later. The only thing Canon video has going for it at this moment are the lenses. The bodies are basically a relic from another era at this point.
DP Philip Bloom wrote a great article on the need for Canon to act NOW, or risk losing serious market share in the video world because so much is starting to happen in that arena. A good read.
5D3 with video by next summer will be too late for a lot of people who will have switched to Sony or Panny by then.
Exactly they have already just about blown it.
That said I don't want some special camera that has all the video features and just dregs tossed into the rest. Give them all the same quality and features. If you want to make one with special video optimized form factor and attachments, sure, but don't crippled the quality and controls in the more still form factored models otherwise their still form factor bodies will look pretty sad.