If you are the sort of person who simply starts tweaking things in advance without really testing them, then you can easily make things difficult for yourself.
Much of what is new to me, like the custom modes, won’t be new to somebody coming from the Nikon D7000. It does feel that this has become the definitive DX camera to track action – sports and wildlife in particular, given the new crop mode (which is of no use to me) and the aggressive focus tracking. But there’s plenty in there for other shooters as well, and the extra resolution and light sensitivity is never a bad thing. What this really means is that this camera really has two types that will be particularly interested in it… If you are looking to shoot action affordably, this is your new camera. If you are an experienced user looking for the most advanced DX format Nikon has to offer at this time, this is also your camera.
Very highly recommended.