We booked before the "new" Premier perks came out (as you can see below from our reservation). From the Q&A it states:
Will I receive the new perks if I purchased Princess Plus or Premier at the old rate of $50/$75 per day?
You can absolutely upgrade to the new perks at the new price! If you do not wish to upgrade, you can enjoy the package with the original perks as you initially purchased them.
Our travel companions called Princess today and were told it would be $20/day to upgrade, which makes no sense to me since we all paid $75/day when we bought it and it's now $80/day, so just a $5/day difference. I was going to call Princess tomorrow to see if I received a different answer since it seems there's a lot of confusion due to all the new changes. Curious if anyone has upgraded from the "old" $75/day Premier to the "new" $80/day Premier and what their cost was. Thanks.