Don't DSLRs heat up considerably when used for video? I would rather use a digital designed for cinema than a DSLR designed for stills but that can also take movies. Horses for courses and all that. The movie camera is going to be designed for the stability and accessories required for movies. In fact, it will probably work with standard cine lenses, standard cone matte boxes, standard cine follow focus, standard cine mounts, standard cine grips, standard cine you get the picture.
For those making home movies, a camcorder is still a batter choice. You can get a newer digital one, or for the larger size, pick up a 3CCD model that records to VHS or has a video out.
Yeah, a camera on the shoulder is easy to control, but that is because most of the weight sits on your shoulder. Even though those are not made for the image stability that a cine camera requires, it will still be a better and much cooler (temperature wise) for home movies.
The thing is, while it is a cool idea, a DSLR isn't a good idea for cine work. While it can run long enough for short scenes, any longer and the camera overheats to the point where it doesn't want to work. On the requirement of special gear, I suggest looking at the konvas/kin or fan website, they have a fairly good discussion about cine and regular lenses.
Needles to say, a DSLR lens is nowhere near a cine lens in what it can do. Two vastly different animals.
Then again, my points are moot, seeing as the companies state these are for short clips and not actual movie work. They don't men a not just not for cine, but not for much else than short videos you want to remember, like a child's first steps. Any movie beyond a couple minutes, and you want a movie camera.
Basically, the companies state that the movie function is to attract customers. You want video, buy a video camera.

Still, this was an interesting, albeit short article: