There's clearly a demand for video capability - here's a photo taken this week showing Chief of Media Ops, Task Force Helmand, Lieutenant Colonel Nick Richardson talking to members of the UK Press covering the Sec State for Defence and Home Secretary's visit to Afghanistan...the PA Photographer on the right of the picture has a small cam-corder attached to his EOS-1D II via a custom-made ally bracket screwed to the tripod mount...he switched it on every time he was shooting stills via a small remote taped to the side of the Canon...
You can just make it out hiding behind the other stills camera with the 70-200...