Aside from general physical traits like eye or hair color, this technology can also be used to create more intelligent babies, taller babies, babies with increased lifespans, and babies with a stronger desire for increased wealth.
Thus far this technology is still in the trial phase, however if it were to be made available to the general public, the cost could be as much as $100,000 per child - meaning that only the most wealthy segments of the population would be able to take advantage of it. It would also mean that these wealthy people would be able to develop children who are far superior, both physically and intellectually, to the general population... which means it would be even more difficult for the "have-nots" to catch up.
While this technology was originally focused on eliminating certain genetic disorders like Huntington's disease, it can also be used at creating a "Master Race." If scientists can simply eliminate certain physical features for the advancement of others, this technology, in the wrong hands could be used as a means of genetic genocide.
Like every developing technology, there are positive and dangerous potentialities. Some would argue that the scientists behind these technologies have a moral responsibility to consider these potentialities before unleashing such a paradigm shifting technology. Others however argue that it is the job of the scientist to explore and create while it is the job of philosophers and the general population to worry about the moral implications of developing technologies.