We all love to give advice. Michael's was fine as far as it went but why stop there....
An Arca-Swiss "plate" on the bottom is only half a loaf; one on the left side like the RRS L-plates would be even better. A bit tricky to get the cables out, maybe, but that should be fun for the engineers to work on.
And a good solution to the above problem and a good thing in its own right would be a wireless remote shutter release (perhaps with some other functions, too). If Canon can do it for it's cheap digicams, why not for the top of the line?
If the camera can capture 5 frames per second why can't it show me 5 previews per second and not bother to record them? I want live, on the LCD focusing so I can critically focus with my non-AF f/10 telescope. Obviously this entails repeated previews at 100% magnification but that's just software. Think of it as a new drive mode: continuous exposures at high speed with previews but not written to the card. It doesn't have to be full video; 5 fps would be more than adequate. Come to think of it, that's just software, too :-)
Record in DNG format. We all know the advanatages of this from the consumer's point of view. Which manufacturer will be the first to figure out that they can do the right thing and save some development costs, too? Why go to all the trouble of supporting proprietary RAW formats and converters when Adobe does it better for free?
At the $7000 price point, how 'bout a built-in GPS? $200 will buy one retail; Canon could probably built one in for $20 but I would be happy to the whole $200.
And one hard one: more bits per pixel, ie more dynamic range. I would much rather have an extra bit or two of depth than an extra megapixel or two of resolution.
And of course, fix the damned MLU ![CODE]