> Solar panels smaller in area than ISS but produces similar amount of power, indicating much more efficient solar panels

I should hope so after over a decade. AFAIK they haven't changed the solar panels since the last one was installed in 2009 and the design was probably fixed well before the first one was installed.

> A robotic arm similar to ISS that walk along the joint points on the station. It has expandable attachment system, allowing not only astronauts to attach, but also a smaller more precises robotic arm to attach that can manipulate external experiments

Canada Arm also walks along the ISS too using alternating ends that astronauts can be attached to.