Apple has released RC (release Candidate) versions of all of it's operating systems!
These rc versions are most likely the same as the public versions being released a weak later.
If you wish to have the updates a bit early, go to settings, general, software updates, Beta updates, and select either iOS 17 public beta or iOS 17 developer beta.
Now exit the beta updates section. You should find iOS 17.0.
Hope this helps, and if you find any new changes and or bug fixes, put them here.