Another addition to ROTJ has been spotted. R2 now has more appendages when he gets shot:
Original
2011
They have also added really crap looking reflections to the 2 blue sections on his front. Also jets of smoke that really do look fake. R2 just looks CG now :( They have also changed his blue colouring in this sequence. Why do that when it's the original colour of R2.
But, as usual with all the SE additions, they completely forgot to add them next time we see R2.