The last day of fall is December 20, so Apple can take sweet time rolling it out.
Other questions:
Apple One release may coincide with Apple Fitness+, as to make Apple One Premier more attractive.
Apple hasn't yet explained whether customers with free trial to Apple Arcade (if you purchase iPhone, iPad, Mac, or iPod touch today, you get 3 months free), Apple Music, and/or Apple TV+ would be compensated.
Apple hasn't yet explained how it intends to compensate customers with prepaid yearly subscription to Apple Arcade and/or Apple Music.
Whether Apple intends to offer yearly discounted subscription for Apple One (my guess is no).
$9.99/month Apple One Student?
Whether iCloud subscribers can purchase additional storage, just like Apple One.