...I'm not likely to buy one unless an unexpected windfall comes my way, and maybe not even then. No, what I'm hoping is that the D4s will cause a lot of D3s owners to upgrade and sell their D3s, causing a sudden drop in the prices of used D3s bodies.
Really, to avoid being at the tail end of the dropping prices, I think all D3s owners should upgrade to a D4s as soon as it becomes available. For your own benefit, you see. Yeah, yeah, that's it -- for your benefit.
I have not seen enough reason to upgrade from my D3s/D3x combination yet.
I'm not prepared to run two separate battery systems (I spend 2-3 months a year on the road shooting overseas and carrying two sets of batteries, chargers and cards is just not acceptable) and I don't see enough benefit to my work in having the D4 or D4s.
For me, a more attractive proposition would be a 16mp D800e. (rather than the Df which is much the same thing but with wrong ergonomics, nice as it looks).
It will basically come down to whether Nikon issues a D4X or not. I.e. this D4/D800 relationship, is that going to be it or not?
As you may know, Canon came out and stated, when their 1DX came out, that they will not be producing two pro bodies. Which leaves a door open for Nikon to do likewise, which Nikon may or may not do? Clearly there is a market for a D4X, in which case they had better go ahead and make it 54mp. But Nikon could also go with a D900 (or D810) instead. Hard to tell these days as things have changed a lot in the current FX model line.
Considering that a D4x would be essentially a studio camera, what economic incentive would there be to choose a D4x over a D800? After all, you could use up 2 1/2 D800's for the probable price of a single D4x. I keep thinking that the D800 really is a "game changer".
I need to get another D4-level body sometime this year. I'm running into too many low-light/no strobe situations where my D2X is not a good solution.
So...depending...Maybe I should add one D4S to my D4...or maybe sell my D4 and get TWO D4S's. Or get another D4...'cause the prices are sure to drop if Nikon continues to make that model. It really is a whole lot easier with my limited brain capacity to have two of the same model bodies.
Escalating Multi-megapixel/super fast CH is of little interest to me. If I need that level of resolution, I have a perfectly good 4X5 long rail camera sitting in my closet, and I can just scan the images I need. I've been taking pictures long enough that I've learned to anticipate what I need, and make ONE exposure rather than 200, though I have friends who are in love with the "motor drive" on the D-series cameras. 2000 exposures during a football half is not unusual for them. I'll have made 30 or 40...maybe.