Problem. I had subs to family iCloud 2TB, family music, free AppleTV+, apple arcade, apple news. I switched to Apple One Premium.
1. All my service subscriptions correctly indicate they will end and be replaced with Apple One at the end of November. Thats fine.
2. The iCloud 2TB is the issue. Right now my family shares that with me. I have an apple ID account for media and purchases through iTunes, a separate Apple ID for myself (they are not the same, never have been), and an apple ID each for the other 3 members of my family. Everyone shares the current 2TB data pool. Right now settings shows that my $9.99 a month 2TB iCloud data package with renew on Nov 3rd and there is no indication it will be replaced by Apple One. Further when setting up Apple One it asked which family ID I wanted to associate the 2TB data package included in Apple One with... I could pick my media/store account, my personal account, or the personal account of any of my 3 family members. What does that mean? Is the 2TB of Apple One data NOT shared but everyone and all accounts? Is my separate $9.99 going to renew? I wonder what to do?
UPDATE!!! It seems my iCloud 2TB family plan was associated with my personal account and my Apple One associated with my media/store account. I was able to select the Apple One plan and CHANGE the iCloud 2TB association to my personal account and it then canceled my $9.99 family 2TB plan. Nothing was lost and all accounts continue to share the data. Had I missed this, and it would be very, very easy to... I would have been playing for Apple One PLUS $10 a month for 2TB of data. Check this if you have multiple accounts!