i think that she should combine (remix) highway unicorn and dance in the dark and then finish it off with aura intro to continue :) because it would conclude her past years and be a nice flashback on the monster ball and the born this way ball. but we never know, she always impresses us with something completely new and beyond :P
I think we should ask her to perform a non-single song from each previous era. I would be very happy if she performs The Fame, Dance in The Dark and Scheiße
I've watch the monster ball 1.0 again yesterday and man, everything was so epic back then! everything she said, every move she made was perfectly timed and loved by everybody! Not that I don't like it the way it is now but it's just, that darkness and mystery through that show and music got everybody going. Right now, only we, the fans love her. General public only critics her :(. I hope she can have those days once again cause she damn deserves it!
The only non-ARTPOP songs that I can realistically see her doing for artRAVE would most likely be Just Dance, Poker Face, Bad Romance, Telephone, and Born This Way.