pc168: The release of Canon 1DX tells us the life cycle of APS-H ends. We can see that high end DSLR product lines have been gradually migrating to FF/FX leaving APS-C as the middle/entry level products.
While D4 is a real update of the D3 (I don’t think it’s a D3Sx or D3Si), it’s nice to see the megapixel war has been slowed down. A 16MP FX sensor (or 18MP FF of 1DX) is a balance between quality and quantity. As a D700 user, if weight does not matter, I would get a D4. But 1340g is really a bit too much (for me).
1340g? Nikonusa.com lists it as 1080. Your D700 weighs 995g without a grip so it's actually heavier than the D4 gripped.