What I would like to see is auto ISO in Manual mode. ie. Set aperture and exposure, and have the camera choose the proper ISO to make the exposure correct. Might be a little dangerous if you forget to update your settings, but that's already something Manual shooters have to stay on top of. Maybe it could have a "High Auto ISO" warning indicator somewhere. EDIT: Maybe this has been done already. I haven't investigated it thoroughly yet.
Not the high ISO warning part, but newer cameras have a functional auto ISO in M mode (not the 5DII, but the 7D, 1D IV, 60D, and some of the newer Rebel/xxxD bodies, and the later ones of those (60D and on) let you specify an upper limit for the Auto ISO that's more restrictive than what is normally the max (ISO 3200 on those cameras). I'd love to be able to have Auto ISO stop at 1250 or so on my 7D...
That is a great feature, and one that i have wanted for a long time. You can sort of get the same thing with a Canon camera, its just not as simple.
The Canon 5D MK III finally brings auto ISO to the manual mode, Set shutter speed and aperture, and it will raise or lower ISO for you to get the right exposure.
The 5D will also let you set a upper limit to ISO, which keeps it from jumping up higher than you want.
With the 5D MK III you also have three saved settings, so you can have a preset for landscape, low light, and fast moving subjects, or whatever you would like.
The Rebels have settings for the type of shot(landscale, low light, fast subject, etc, and bias shutter speeds and or apertures and thus ISO accordingly. It may not be obvious to some exactly what is going on.
Personally, I like Nikon's idea. However, I do not expect different companies to make identical cameras with identical features, we have a choice to get what we value most, but we don't get everything in one body.
This is good news. I've been shooting with the 5D2 so long, I've gotten behind on the complete features of the other bodies.
I like the custom registered settings (C1-C3) but I wish it were easier to register the settings on the go. In my shooting, I often line up a shot beforehand, and I'd like to be able to quickly register it and continue shooting other things and switch to the C1-C3 setting when needed. The current menu navigation is too cumbersome for me.
I agree that we shouldn't expect all features to act the same across brands or even the major model lines (Rebel, 60D, 5D, 1D) but I really, really, really like seeing as many options as possible. Even if some options are obscured in custom functions and I never use anything but the default setting, I like seeing the ability to change it. More options the better. That's how I got into back-button-focus before getting a camera with a dedicated AF-On button.