If I learn anything here on NikonGear, it is how we each value cameras and lenses differently. Why I LOVE the D810 is because of two main reasons:
(1) A true ISO 64. The enhanced blacks were, IMO, a great move forward for my work and probably what inspired me to want to segue into MF range.
(2) A useable LiveVIew. It is not all that I really need, but unlike the D800 and D800E, which were not really usable, the LiveView on the D810 has been useable enough that I have yet to even use the OVF, except to verify that it works.
So yes, I look forward to the specs on the D910 (or whatever name it will bear), but it would have to have at least what I outlined above, plus more megapixels. If I could afford it, I would have 100 Mpx, for sure, not because I want to make billboards, but because of all the advantages of large sensors, which I won’t repeat here.
It will be interesting to compare what the FF sensor can do compared to the new small MF cameras like the Hasselblad X1D and the Fuji GFX.