Intelligent beyond removing very localized mutations that impair "normal" function? I'd be interested in a expert too, but only a little bit, as I would expect them to have very high uncertainty. We only know a little bit about the interaction between genes and intelligence. First we'd have to understand that, and then we might be able to have children pre-disposed to the current upper range of humanity. But if you mean really "super," we'd have to understand a lot more about the algorithms for creativity, insight, etc. and then probably do a lot of redesign. Which might be the difference between breeding a better bird and building an airplane.