2. Canon USA has posted an interesting article on using the 7D for shooting video: Harnessing the Power of the EOS 7D’s Video System
Traditional movies, shot on actual film, are shot at true 24 fps. Video from an EOS 7D, taken alongside actual film (which we anticipate will be done from time to time in Hollywood studios) is shot at an actual rate of 23.976 fps; it would have to be speeded up very slightly in the computer to exactly match film — normally, very easy to do.
Keep in mind that even though the Mode Dial has settings for Tv (shutter-priority automatic) and Av (aperture-priority automatic), these are for still image shooting only.
It also links to the article; EOS 5D Mark II: How to Use Manual Video Exposure and the section: Shutter speed range in Manual Exposure shooting
3. A thread on dvxuser points out that the EOS Utility can be used to remotely control the Canon 7D - including adjusting focus - from the computer, suggesting it would be possible to do a kind of rack focus with the software. An interesting thought, even if you do have to drag a laptop around with you.