It really depends on the tweaks they make before final release. At this point, I would imagine there won't be many hardware changes, but software tweaks might very well be in the works.
Either one will do the trick.
Since high ISO noise seems to be one area Nikon is focusing on mentioning with the new releases, one would expect things to have been beefed up. I shoot high ISO pretty much all the time at concerts and I think the D200 did a great job of cleaning things up.
I'd say the differences in normal size prints aren't going to be noticeable.
Some other things are going to be much more important than the concept of who's got the best noise reduction in camera or which has the lowest noise levels. Getting the right exposure is one element that can't be overlooked as are in camera settings.
Focus on what you need for your shooting in the way of lenses and accessories and what is going to be the best fit for you.
Julio
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