Quick & dirty comparison for 7D, 5D Mark II, and this spotted model.
As canonrumors points out:
No popup flash
Joystick on the battery grip
On the top:
Exposure mode dial:
Creative Auto seems to have gone: Fully Automatic, P, TV, Av, M, then 4 more I can't make out (presumably B, C1-C3)
On-Off switch ala 7D WB, AF-Drive, ISO, Bulb on the top (Metering mode, AF mode, ISO sensitivity, bulb, M-Fn.
On the back:
Menu & Info side by side, ala 1DX. but with a whole column of buttons like the 5D MkII and the 7D.
On the LHS from the bottom: Erase, Play, Zoom, ??, ??
Start/Stop of the 7D (not 5d MkII/1DX), mini joystick, On screen settings adjustment Q Menu on the button below it.
Mini-joystick on the grip.