Maybe nobody answers your questions because nobody knows the answer ? I cant remember if they said something about this issue. Havent they said they want to integrate the camera in the Xbox or something like that ?
I guess if they need your feed or legs to track so there should be some space. To catch your whole body the camera needs some distance. But Japan is not the main market and in Europe or America the poepl should have enough more than enough space except you are living in a small flat as student. Or some teenager which lives under moms rooftop.
I can imagine that this Camera needs a lot of Processing Power, especially if it have to track the movement of more people. Maybe it will have an effect on the Graphics ? Sony wants to integrate it someway in the OS so it is enough if the SPU which is just for the OS take care over it.







