A few interesting questions which I'm afraid I dont have ready answers for unfortunately.
I too had been told that the cabin width had increased by a couple of cm so I am not sure whether my information is as accurate as I had hoped.
The overall length of the airframe is increased, however the new MRB system means that overall the signature of the S is slightly less than that of the E.
I'm not sure how tha baggage bay volume can less (if in fact it is) than that of the E but I will find out.