Ahhh - i had one of the refreshed planes on my recent JFK>LHR 3 Jan - the IFE was much quicker/responsive than normal and the moving map seemed to be improved. However due to the shortness of the fligth and being the 'red eye' i didnt use it much and went straight to sleep after some food.
Seats and everything else seemed to be the same - including some very filthy side bins on 62K..