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*) with different communication protocol, different chips and software to control that protocol, another manufacturing process and robots for cards, connectors, on both camera and memory card sides,...
yes, could happen with one serie of CF card from one manufacturer too, but did it? I still believe XQD was just another nail into D4 coffin. Almost all heavy D3s users around me yawned totally over D4, same as i did. I believe nikon will make this upgrade cycle much faster and we will see D4s or D4x (or both) earlier then expected.
I just use the darn thing and not a techie person, so just for my curiousity, but what do you find lacking in the D4 that Nikon would release a D4s? The improvements are not monumental from the D3s, but they are there. The D4 have the same or better ISO, more FPS, better DR, Higher resolution, more color dept, better video, faster memory speed, larger screen, and a huge buffer. Battery life is shorter, but I don't see that as a problem. I would think Nikon will have to work a hard to make further improvements from these. So what are we talking about 1-2 years, 2-3 years, or 3-4 years? A D4x with higher res? I don't know, the D800/E kind of taken care of that.