There is a huge site from a magazine here in Brazil, said that Madonna will launch a competition to choose the cover art for the remixes CD of "Superstar" The competition will be made at a workshop in partnership with Johnnie Walker (drink) and choose an art made by a Brazilian graffiti artist. Madonna will be chosen when she comes to Brazil in December with MDNA Tour.
Edit: Well, for those who said that this was a rumor, the competition is still going on and here some finalists:
I love Superstar. I know everyone hates it because of the lyrics and production, but it has such a cute, carefree, beachy vibe that reminds me of True Blue and Cherish, which were both hits. IMO, I would've picked this as a single over Turn Up The Radio or GMAYL.