I would rather not have superpowers, they all abuse their power. I wish I could say the UK, but I don't trust my own country enough. If we must have superpowers, I kinda hope it is someone who will provide balance opposite the USA.
I would like to see the UN built up into what it should be, moving away from the power of the 5 key victors of the second World War (the Permenant Members of the Security Council) and into something fairer.
I would like to see nations giving their little ex-empire bases to the UN to control-
UK Cyprus bases, Gibraltar, Guantanamo Bay, etc. That way the UN would have more clout and militaries could still use them, but only for UN supported missions. That would then mean no more Iraq -style wars without UN support. It would also reduce the tension of one country owning part of another country.