That would be a society with such immense productive capacity and automation that it will change culture, education, and social relations so concepts like a police force may look significantly different (for example, the roles of a police force as we understand it now to be taken up by other sectors of society). Furthermore, given our growing understanding of epigenetics, microbiomes and medicine (as a discipline not just pharmaceutics), not withstanding bioengineering, the above quality of life improvements will likely change our biology as human beings as a whole.

This maybe a cop out answer but that is because we do not have the education yet of what a communist society will entail in the finer details; just a good scientific understanding how to get there. Heck, we haven't even achieved global socialism yet. Quantitative changes will lead to changes of quality of society.