Sales of the D4 have been hurting, so a minor upgrade will put it on a competitive level. A better processor and improved autofocus. Both of these were weak points, but we have to see how much improvement there actually is. Nikon seems to be playing a game with gullible buyers, first the D620 and now the D4s. Mostly just a label change to get those with $$$ to buy the latest and greatest.
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