The D750 is almost identical to the D610 in size and weight. It is 10 grams lighter and 0.1 inches smaller in two dimensions. Handling the camera is very similar with button layout only slightly changed (to match the left side buttons as on current D7100) .

There are some notable improvements over the D610, many focused on video. First we have the ability to control aperture during live view, something the D610 was not capable of. Even more, we get power aperture control (smooth transition between apertures) during live view video recording with the D750. And it also has a tilting vari-angle 3.2-inch LCD screen. This is something not offered on any other Nikon FX camera.

The D750 also get the new 51-point autofocus system (MultiCAM 3500FX) with group area AF as found on the D810 and D4s. We get Nikon’s latest 91,000 pixel RGB sensor with highlight weighted mode.

Back to video, the D750 has a menu that puts all video controls and settings in one place. There is a built-in stereo mic,  a flat picture control, highlight display zebra stripes, and the ability to use auto ISO during manual mode. We get the normal frame rates in 1080 HD that we expect: 24/25/30/50/60p.

On top of this, there is also built-in WiFi, another first for Nikon FX cameras. What is clear is this camera is very close to professional level specs, but is still in the consumer configuration with a mode dial, compact size and light weight. The perfect camera for many. Only the die-hard professionals may be left wanting more. 

You can pre-order the new Nikon D750 to be the first to get the new camera. There is a list of retailers and offers and further information.