Winfield Village isn’t nearly as big or as dense as what Steve Randy Waldman means by microcities. But it and adjacent complexes house a few thousand people near a handful of bus stops (along with a grocery store, two drug stores, a shoe store, several restaurants, and a movie theater).
“high density exurban developments, subject to constraints including a minimum population size and, importantly, a requirement that the entire city be built within walking distance of a central transit station.”
Source: interfluidity » Microcities