I have spoken with the guys at BC and they are working on an official response.
In the meantime for the record the facts are:
Head Sculpt - is the same as the approved sculpt and has NOT changed
Hair - is still being refined
Skin colour - as approved complexion
Jacket - material used is thicker than used for prototype, looking at improving the way this falls
Skirt - Amy’s skirt is actually blue/black stone washed denim, not blue, so was changed for production
Tights - were always grey, lighting made these look somewhat bluer in tone, but they have always been grey
Boots - have NOT changed
Greggo