The back pack looking thing is what is holding his cape. It springs out of it when he dives off of the building in Hong Kong. Also could be the skyhook rig as well but it was never shown before it was launched.
On his belt is the break apart sticky bomb gun which he used in Hong Kong. Both pieces on the belt make up the Bomb gun. It is a Pump-action gun that Batman uses to fire timed "sticky bombs"; another gadget he packs away in his utility belt. The one on the left has the dial to set the bomb time.
Speculation on forums: he has his back to us because he doesn't want to reveal his best feature. Light up Bat-Sonar Lenses!
We'll have to wait and see what Hot Toys choose to reveal in the coming weeks