I have finally acquired a BG-E12 for my 5D Mark III. The construction quality is an obvious improvement over the BG-E6 grip for 5D Mark II. There are also a few new design changes. The most significant in my opinion is that canon has finally decided to add a multi-controller “mini-joystick” on the grip making it much easier to select focus points when shooting in portrait orientation. This has been one of my major gripes in the past about previous Canon battery grips.
View of the grip from the front, no obvious change here.
The view from the back. You can clearly see the multi-controller here. Incidentally, the BG-E12 is still made in Japan, unlike the grip for the 7D and 60D, which are made in Taiwan.
You can from the side view that the batteries are inserted from the side with a carriage like the grip for 60D rather than like the grip for 5D Mark II.
A view from the other side, where you can see the on/off switch for the grip.
Front view of the 5D Mark III with the grip.
Rear view of the 5D Mark III with the grip.