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I think both canon and nikon have done really poor jobs positioning their DSLR models. Way too confusing and far too much overlap. They are throwing crap against the wall hoping something will stick when there should be clear differentiation among models. The delay in replacing the D300 has been a joke. Same for Nikons overall crop camera and lens family. They have lost momentum in this format ever since they launched the D3 and variants juggernaut.
I agree with that. Ten years ago, it was easy to keep with Nikon's lineup. You had the DX series that were pro cameras (D1, D2, etc.), the DX00 series that were prosumer cameras, and the DX0 series that were somewhat of an entry level series. And every new model was the next number up. Then they went nuts with the D3000, D5000, D7000, went from the D300 to the D700 which aren't the same class, then the D800 (which actually was an update to the D700), but then come out with the D600 which is a FX camera in the body similar to the D7000. Until a couple of weeks ago, I thought the D600 was just another DX camera in a small body. I was surprised to learn it's a FX camera. Keep it simple.
As for the D400, I'll believe it when I see it. But if they are making it, then it needs to have the innards of the D600 with a DX sensor and the same buttons as the D300 and D700. Anything less than that, people will just gravitate toward the D7100.