There is a lot of activity happening in the world of Smart Cities in Australia and around the world right now. If you've not read these reports are excellent examples of current thought leadership
ACS: Data61: Blockchain 2030 (April 2019)
Sustainable Smart Cities: Urban Digital Twins for Smart Cities and Citizens:The Case Study of Herrenberg, Germany Fabian Dembski, Uwe Wössner, Mike Letzgus, Michael Ruddat and Claudia Yamu,*(March 2020)
NSW Govt: The circular economy opportunity in NSW (October 2020)