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I wouldn't hold out much hope, Barry. Invariably new models mean incompatibility and something else for Nikon to sell you. At most, Nikon seem gracious enough to make a battery grip spanning one model and its successor (as well as other models released at around the same time), before an entirely new grip/battery system is required. I highly suspect the D400/D800 will be using the newer EN-EL15, as featured in the D7000, which has eclipsed the older EN-EL3e found in the D80/ D90, D200/D300/D700.
As for the D4, the EN-EL4a featured in the D3, is a powerful battery at 2500Mah and may be sufficient for its new replacement. Still, those have been used in the D2x and D3x and if Nikon follows its pattern, this may very well be overhauled too, with the possibility of seeing something nearer the 3Ah mark and of course, a different shape to boot.
Grips and batteries aren't cheap, especially for the D3 series. Looking at the prices of a genuine Nikon EN-EL4a, I can totally appreciate why you hope the grip and batteries remain compatible!
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