You know, I bought a new camera in the summer (Canon 40D). The problem
with photography is that technology is improving so fast, if you stay
in tune with the developments, you'll never be satisfied with what you
have (one of the reasons why I had no idea about the 5D Mk2 -- I made
an effort to stay off websites that review these things).
To be honest, the camera seems to be a significant step up, but people
shouldn't mistake that spectacular video for the work of the camera.
Most of what makes that video so great is the lighting. You would have
been able to capture the scenes just as nicely -- I suspect -- with
available technology, though definitely not in a
camera/camcorder-in-one (for which the 5D is new). Also, when they say
that the video is unaltered, what they mean is that the video is
unaltered post-download. I suspect that the 5D camera, itself,
post-processes the video (sharpens, brightens, saturates, etc.).
Do I see a 5D Mk2 in my future? Hopefully not. Because I went with the
40D, most of my lens are designed for crop cameras (like the 20D,
Rebel XT, etc.). The 5D and 10D series are full-frame cameras -- so I
would have to sell half my lenses.
It's also a good question as to who needs this tech. They're marketing
this towards professional wedding togs, mainly because of the video
capabilities. Will other photographers -- like landscape, city,
architectural, etc. -- benefit as much? Perhaps. But I think the
difference between the 5D and the much cheaper 40D (about 4x less) is
much smaller for the rest of the world.
Undoubtedly, though, 10 years down the line, video/photo capabilities will
be standard in all cameras. A bit intimidating if you ask me.