We'll have massive libraries of re-usable "components" for interesting DNA-sequences. People will slowly slice together more complicated features, and freely trade organic components with each other via post. At some point in the future electronics will catch up to bioengineering, leading to better ways to make changes to DNA. We'll eventually be able to change DNA in something like a "biology IDE" and have usable components printed out the other end. After that point, our world probably won't look anything like it does today.
It won't be long before someone decides to give themselves glowing skin or super strong muscles (and people have already tried the latter!) I for one welcome our super-human overlords.