Perhaps I should make an implicit point explicit: if we get to a stage where humans can modify their own minds, it is highly likely that this will get rid of the psychological unity of the human race. Everyone else has been posting on how "people will (all) do this, be like this, etc". The reality is that there may well be on the order of (6*10^9)/100 ~ 10^7 separate psychological niches into which groups of co-self-modifying humans eventually splinter into, as humans with similar preferences gather together into groups of people with similar preferences, the limiting factor being that you don't want to be in too small a group. Perhaps this number is a overestimate due to vast duplication of desired end-states in self-modification space.
An interesting question is: how many people will want to become superintelligent? Even if only all of the academics in the world did this, you'd still have about 10^5 superintelligent posthumans running around. What would they get up to? Will there be a gender imbalance in humans who want to become superintelligent? [look at the gender balance of the h+ and s^ lists, for example]
Utopia and Dystopia have something in common: they both confirm the moral sensibilities you started with. Whether the world is a libertarian utopia of the non-initiation of violence and everyone free to start their own business, or a hellish dystopia of government regulation and intrusion—you might like to find yourself in the first, and hate to find yourself in the second; but either way you nod and say, "Guess I was right all along."
So as an exercise in creativity, try writing them down side by side: Utopia, Dystopia, and Weirdtopia. The zig, the zag and the zog.
I'll start off with a worked example for public understanding of science:
Disclaimer 1: Not every sensibility we have is necessarily wrong. Originality is a goal of literature, not science; sometimes it's better to be right than to be new. But there are also such things as cached thoughts. At least in my own case, it turned out that trying to invent a world that went outside my pre-existing sensibilities, did me a world of good.
Disclaimer 2: This method is not universal: Not all interesting ideas fit this mold, and not all ideas that fit this mold are good ones. Still, it seems like an interesting technique.
If you're trying to write science fiction (where originality is a legitimate goal), then you can write down anything nonobvious for Weirdtopia, and you're done.
If you're trying to do Fun Theory, you have to come up with a Weirdtopia that's at least arguably-better than Utopia. This is harder but also directs you to more interesting regions of the answer space.
If you can make all your answers coherent with each other, you'll have quite a story setting on your hands. (Hope you know how to handle characterization, dialogue, description, conflict, and all that other stuff.)
Here's some partially completed challenges, where I wrote down a Utopia and a Dystopia (according to the moral sensibilities I started with before I did this exercise), but inventing a (better) Weirdtopia is left to the reader.
Economic...
Sexual...
Governmental...
Technological...
Cognitive...