A leaked carrier email suggests that customers have until October 20 to pre-order the iPhone 12 and Apple Watch Series 6. It indicates that the iPhone 12 will be released sometime in October. However, the email neglects to mention which variants of the iPhone 12 it pertains to.
https://www.notebookcheck.net/iPhone-12-Leaked-promotional-material-hints-at-an-October-release-date.492633.0.html