Now that the 7DM2 incorporates a Dual Pixel CMOS, you'll need to get STM lenses for best Live View performance. Sadly, there are no fast, high-quality STM lenses.
If it ain't broke...
The most important controls haven't changed.
Mode dial update
A new lever around the joystick is designed to make it easier to cycle through AF point configurations. But the fixed, non-touchscreen LCD makes me sad.
Double card capable
Two card slots -- one CF and one SD -- are a welcome update.
Canon joins a slowly growing group of manufacturers starting to add USB 3 to their cameras.
In addition to a mic input and a headphone jack, there's a wired remote connector and a PC socket.