There was discussion about this in several other threads, and the general understanding is that Nike experienced some supply issues with their Chinese factories being closed for a period of time this winter/spring due to COVID-19. While I'm sure these shoes (whatever style they may be this year) were designed at some point in 2019 and possibly produced (or at least production-ready) at this point, especially given that a new polo shirt has appeared for teams on Nike's website indicating that there is new inventory that has been produced, my guess is that Nike is holding off until there's no more uncertainty regarding Week Zero. I bet they'll release the last week of August, but that is just a relatively-uninformed inkling.