Re: Nikon D750 and D400
The built in flash is always going to divide people.
It's saving grace is that it is a commander unit, so my SB600s can sit off camera and have full iTTL control.
Live view isn't particularly important in itself, but as I use the camera on an extended boom arm sometimes, the live view comes into it's own when using camera control pro 2 - I can use a netbook to control the system without having to be on top of it.
Video is pointless unless it is full video. Most of the SLRs I've seen with video can't focus or zoom whilst exposing - what is the point of that?!
Don't expect any 750/800 to drop the price of the 700. It would be nice, but it ain't going to happen - look at the D3/D3x prices for your guidelines
The worst battle cry I ever heard - "Look out! He's got a bigger camera!"