Janey, thanks for the links, I am already familiar with the seating plans as I have already reserved seats in both types of aircraft.
Oldbalboy, you have confirmed my fears that the space at the rear of the cabin is now replaced by an area outside the cabin behind the catering storage units between the doors and shared by both cabins. This will be be both busy and exposed and not usable as an exercising area; for me this is a retrograde step. However, surely this also means that the two adjacent toilets are also accessible from both cabins so Premium passengers only have exclusive use of a single lavatory which is at the front, is this correct?