The new arm PCB has arrived and I spent this evening for soldering it.
Below is a picture with the old (right) and new (left) PCB.
Testing will begin in few days. First I have to connect motors and sensors to the new PCB and then to update the software for controlling the new arm (left arm will currently be controlled by the old electronics and the right arm will be controlled by the new electronics). The HTML5 client and server should be significantly updated since they don't include any code for controlling the right arm.