My thought is that selection and evolution will continue even with extensive genetic engineering. The new humans with either be well suited to their environment or they won't. We humans who make mistakes will create new humans that we think are so much better, but chances are that there will be unintended consequences. Perhaps the gene that makes people so beautiful will increase cancer; ;perhaps the gene that makes people so kind will take away their ambition, etc, etc.
Selection will occur on the group level too. Perhaps the new race of supermen that we create will simply not have a desire for children. That would doom them for sure.
There are MANY selection pressure in this world and a little tinkering will not make them go away. The US and the world have had a nice run of wealth so that the agents of selection have appeared to diminish, but they are stll very much there. Ask yourself this, are some people more likely to die in a war? Are some more likely to survive. As just one small example, war will always be with us so that selection is still very active. In a similar way, do some people have an easier time getting married than others? Again, a method of selection that is still very active.